Search in comments of specific content type
For this you need to enable vote up/down and voting api module enabled
Then enable voting for 'Proposal' content type mentioned in the image



Now import the below code mentioned in views. 

$view = new view();
$view-&gt;name = 'proposal_comments';
$view-&gt;description = '';
$view-&gt;tag = 'default';
$view-&gt;base_table = 'comment';
$view-&gt;human_name = 'Proposal comments';
$view-&gt;core = 7;
$view-&gt;api_version = '3.0';
$view-&gt;disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Master */
$handler = $view-&gt;new_display('default', 'Master', 'default');
$handler-&gt;display-&gt;display_options['title'] = 'test comments';
$handler-&gt;display-&gt;display_options['use_ajax'] = TRUE;
$handler-&gt;display-&gt;display_options['use_more_always'] = FALSE;
$handler-&gt;display-&gt;display_options['link_display'] = 'custom_url';
$handler-&gt;display-&gt;display_options['access']['type'] = 'none';
$handler-&gt;display-&gt;display_options['cache']['type'] = 'none';
$handler-&gt;display-&gt;display_options['query']['type'] = 'views_query';
$handler-&gt;display-&gt;display_options['query']['options']['distinct'] = TRUE;
$handler-&gt;display-&gt;display_options['exposed_form']['type'] = 'basic';
$handler-&gt;display-&gt;display_options['pager']['type'] = 'full';
$handler-&gt;display-&gt;display_options['pager']['options']['items_per_page'] = '10';
$handler-&gt;display-&gt;display_options['style_plugin'] = 'default';
$handler-&gt;display-&gt;display_options['row_plugin'] = 'comment';
/* Relationship: Comment: Content */
$handler-&gt;display-&gt;display_options['relationships']['nid']['id'] = 'nid';
$handler-&gt;display-&gt;display_options['relationships']['nid']['table'] = 'comment';
$handler-&gt;display-&gt;display_options['relationships']['nid']['field'] = 'nid';
$handler-&gt;display-&gt;display_options['relationships']['nid']['required'] = TRUE;
/* Relationship: Comment: Votes */
$handler-&gt;display-&gt;display_options['relationships']['votingapi_vote']['id'] = 'votingapi_vote';
$handler-&gt;display-&gt;display_options['relationships']['votingapi_vote']['table'] = 'comment';
$handler-&gt;display-&gt;display_options['relationships']['votingapi_vote']['field'] = 'votingapi_vote';
$handler-&gt;display-&gt;display_options['relationships']['votingapi_vote']['votingapi'] = array(
  'value_type' =&gt; 'points',
  'tag' =&gt; '',
);
$handler-&gt;display-&gt;display_options['relationships']['votingapi_vote']['current_user'] = 0;
/* Relationship: Comment: Vote results */
$handler-&gt;display-&gt;display_options['relationships']['votingapi_cache']['id'] = 'votingapi_cache';
$handler-&gt;display-&gt;display_options['relationships']['votingapi_cache']['table'] = 'comment';
$handler-&gt;display-&gt;display_options['relationships']['votingapi_cache']['field'] = 'votingapi_cache';
$handler-&gt;display-&gt;display_options['relationships']['votingapi_cache']['votingapi'] = array(
  'value_type' =&gt; 'points',
  'tag' =&gt; '',
  'function' =&gt; '',
);
/* Field: Comment: Title */
$handler-&gt;display-&gt;display_options['fields']['subject']['id'] = 'subject';
$handler-&gt;display-&gt;display_options['fields']['subject']['table'] = 'comment';
$handler-&gt;display-&gt;display_options['fields']['subject']['field'] = 'subject';
$handler-&gt;display-&gt;display_options['fields']['subject']['label'] = '';
$handler-&gt;display-&gt;display_options['fields']['subject']['alter']['word_boundary'] = FALSE;
$handler-&gt;display-&gt;display_options['fields']['subject']['alter']['ellipsis'] = FALSE;
/* Field: Comment: Comment */
$handler-&gt;display-&gt;display_options['fields']['comment_body']['id'] = 'comment_body';
$handler-&gt;display-&gt;display_options['fields']['comment_body']['table'] = 'field_data_comment_body';
$handler-&gt;display-&gt;display_options['fields']['comment_body']['field'] = 'comment_body';
/* Sort criterion: Comment: Post date */
$handler-&gt;display-&gt;display_options['sorts']['created']['id'] = 'created';
$handler-&gt;display-&gt;display_options['sorts']['created']['table'] = 'comment';
$handler-&gt;display-&gt;display_options['sorts']['created']['field'] = 'created';
$handler-&gt;display-&gt;display_options['sorts']['created']['order'] = 'DESC';
/* Filter criterion: Comment: Author */
$handler-&gt;display-&gt;display_options['filters']['name']['id'] = 'name';
$handler-&gt;display-&gt;display_options['filters']['name']['table'] = 'comment';
$handler-&gt;display-&gt;display_options['filters']['name']['field'] = 'name';
$handler-&gt;display-&gt;display_options['filters']['name']['exposed'] = TRUE;
$handler-&gt;display-&gt;display_options['filters']['name']['expose']['operator_id'] = 'name_op';
$handler-&gt;display-&gt;display_options['filters']['name']['expose']['label'] = 'Author';
$handler-&gt;display-&gt;display_options['filters']['name']['expose']['operator'] = 'name_op';
$handler-&gt;display-&gt;display_options['filters']['name']['expose']['identifier'] = 'name';
$handler-&gt;display-&gt;display_options['filters']['name']['expose']['remember_roles'] = array(
  2 =&gt; '2',
  1 =&gt; 0,
  3 =&gt; 0,
);
/* Filter criterion: Comment: Comment (comment_body) */
$handler-&gt;display-&gt;display_options['filters']['comment_body_value']['id'] = 'comment_body_value';
$handler-&gt;display-&gt;display_options['filters']['comment_body_value']['table'] = 'field_data_comment_body';
$handler-&gt;display-&gt;display_options['filters']['comment_body_value']['field'] = 'comment_body_value';
$handler-&gt;display-&gt;display_options['filters']['comment_body_value']['operator'] = 'contains';
$handler-&gt;display-&gt;display_options['filters']['comment_body_value']['exposed'] = TRUE;
$handler-&gt;display-&gt;display_options['filters']['comment_body_value']['expose']['operator_id'] = 'comment_body_value_op';
$handler-&gt;display-&gt;display_options['filters']['comment_body_value']['expose']['label'] = 'Comment (comment_body)';
$handler-&gt;display-&gt;display_options['filters']['comment_body_value']['expose']['operator'] = 'comment_body_value_op';
$handler-&gt;display-&gt;display_options['filters']['comment_body_value']['expose']['identifier'] = 'comment_body_value';
$handler-&gt;display-&gt;display_options['filters']['comment_body_value']['expose']['remember_roles'] = array(
  2 =&gt; '2',
  1 =&gt; 0,
  3 =&gt; 0,
);
/* Filter criterion: Comment: Post date */
$handler-&gt;display-&gt;display_options['filters']['created']['id'] = 'created';
$handler-&gt;display-&gt;display_options['filters']['created']['table'] = 'comment';
$handler-&gt;display-&gt;display_options['filters']['created']['field'] = 'created';
$handler-&gt;display-&gt;display_options['filters']['created']['exposed'] = TRUE;
$handler-&gt;display-&gt;display_options['filters']['created']['expose']['operator_id'] = 'created_op';
$handler-&gt;display-&gt;display_options['filters']['created']['expose']['label'] = 'Post date';
$handler-&gt;display-&gt;display_options['filters']['created']['expose']['operator'] = 'created_op';
$handler-&gt;display-&gt;display_options['filters']['created']['expose']['identifier'] = 'created';
$handler-&gt;display-&gt;display_options['filters']['created']['expose']['remember_roles'] = array(
  2 =&gt; '2',
  1 =&gt; 0,
  3 =&gt; 0,
);
/* Filter criterion: Votes: Value */
$handler-&gt;display-&gt;display_options['filters']['value']['id'] = 'value';
$handler-&gt;display-&gt;display_options['filters']['value']['table'] = 'votingapi_vote';
$handler-&gt;display-&gt;display_options['filters']['value']['field'] = 'value';
$handler-&gt;display-&gt;display_options['filters']['value']['relationship'] = 'votingapi_vote';
$handler-&gt;display-&gt;display_options['filters']['value']['exposed'] = TRUE;
$handler-&gt;display-&gt;display_options['filters']['value']['expose']['operator_id'] = 'value_op';
$handler-&gt;display-&gt;display_options['filters']['value']['expose']['label'] = 'Value';
$handler-&gt;display-&gt;display_options['filters']['value']['expose']['operator'] = 'value_op';
$handler-&gt;display-&gt;display_options['filters']['value']['expose']['identifier'] = 'vote';
$handler-&gt;display-&gt;display_options['filters']['value']['expose']['remember_roles'] = array(
  2 =&gt; '2',
  1 =&gt; 0,
  3 =&gt; 0,
);

/* Display: Page */
$handler = $view-&gt;new_display('page', 'Page', 'page');
$handler-&gt;display-&gt;display_options['path'] = 'test-comments';

/* Display: Block */
$handler = $view-&gt;new_display('block', 'Block', 'block_1');
$handler-&gt;display-&gt;display_options['link_url'] = 'demo';


It will create a block in the admin/structure/block mentioned 
 in the below image. Assign it to 'Proposal' content type.


It will be displayed under proposal node view page this way



Hope it will help you.