<form action="http://www.google.com/search" class="searchform" method="get" name="searchform" target="_blank">
<input name="sitesearch" type="hidden" value="www.sanwebcorner.com">
<input autocomplete="on" class="form-controls search" name="q" placeholder="Search in sanwebcorner.com" required="required"  type="text">
<button class="button" type="submit">Search</button>
</form>