Remove "Submitted by" on search results
Try below code in your template.php

&lt;?php
  function YOURTHEME_preprocess_search_result(&amp;$variables) {
  $variables['info'] = '';
  }
?&gt; 


Or create a template file for search results if not there  named "search-result.tpl.php" and add this 

&lt;li class="&lt;?php print $classes; ?&gt;"&lt;?php print $attributes; ?&gt;&gt;
&lt;?php print render($title_prefix); ?&gt;
 &lt;h3 class="title"&lt;?php print $title_attributes; ?&gt;&gt;
   &lt;a href="&lt;?php print $url; ?&gt;"&gt;&lt;?php print $title; ?&gt;&lt;/a&gt;
 &lt;/h3&gt;
 &lt;?php print render($title_suffix); ?&gt;
   &lt;div class="search-snippet-info"&gt;
  &lt;?php if ($snippet): ?&gt;
    &lt;p class="search-snippet"&lt;?php print $content_attributes; ?&gt;&gt;&lt;?php print $snippet; ?&gt;&lt;/p&gt;
&lt;?php endif; ?&gt;
&lt;?php if ($info): ?&gt;
  &lt;p class="search-info"&gt;&lt;?php print $info; ?&gt;&lt;/p&gt;
&lt;?php endif; ?&gt;
&lt;/div&gt;
&lt;/li&gt; 


and To remove the author, date and comments count remove or comment out the following lines:

&lt;?php if ($info): ?&gt;
  &lt;p class="search-info"&gt;&lt;?php print $info; ?&gt;&lt;/p&gt;
&lt;?php endif; ?&gt;


and in css

.search-info {
display: none;
}


Taken answer from this link