php - Search Bar is not working when search category -

i had added search bar through sidebar , called in header.php.it's working posts/products not categories. please me custom search.php search categories. search.php file here...

<?php if ( have_posts() ) : ?> <header class="page-header">     <h1 class="page-title"><?php printf( __( 'search results for: %s', 'mysite' ), get_search_query() ); ?></h1> </header><!-- .page-header --> <?php     // start loop.     while ( have_posts() ) : the_post();         /*          * include post format-specific template content. if want          * use in child theme, include file called called content-___.php          * (where ___ post format) , used instead.          */         get_template_part( 'content', get_post_format() );     endwhile;         // previous/next post navigation.     mysite_paging_nav();     else :         // if no content, include "no posts found" template.     get_template_part( 'content', 'none' );     endif; ?>