Search results - Show custom fields
You have two options:


You can use Display Suite module. A sub-module Display Suite Search allows you to change the way nodes are displayed for search results.
You can use template_preprocess_search_result() together with a copy of modules/search/search-result.tpl.php in your theme. Read thoroughly the comments in the search-result.tpl.php as they will help you understand what is going on and what is available to you.
You can define variables this way: $variables['your_value'] = $variables['result']['node']->field_sample[LANGUAGE_NONE][0]['value']; and use it in the .tpl file like this: print $your_value;.