I want to create search form but when I search something nothing happen
and this is the code:
index.php:

 <div class="tech-btm">
      <?php get_search_form();?>
 </div>

searchform:

<form role="search" method="get" id="searchform" action="<?php echo home_url('/')?>">
    <div><label class="screen-reader-text" for="s">Search for:</label>
        <input type="text" value="" name="s" id="s" />
        <input type="submit" id="searchsubmit" value="Search" />
    </div>
</form>

what is the problem?
Is there anything wrong?