Display Search Results by tag_ID in my search.php

Filter it using pre_get_posts, like this:

function searchfilter($query) {
    if ($query->is_search && !is_admin() ) {
        if(isset($_GET['venue_type_search'])) {
            $venue_type = $_GET['venue_type_search'];

            $query->set('tag',array($venue_type));

        }       
    }
    return $query;
}
add_filter('pre_get_posts','searchfilter');