Include search tags and users in my search results system

This is my codes for search posts by ajax:

PHP:

public function search_posts(){
    try {
        $data = $_POST['content'];
        $data = wp_parse_args( $data, array(
            'post_type'     = 'post',
            'post_status'   = 'publish',
        ) );

        if ($data['s']){
            global $theme_query;
            $theme_query['s'] = explode(' ', $data['s']);
        }

        $query = new WP_Query($data);

        $data  = array();

        foreach ($query-posts as $search_post) {
            $search_post            = get_post($search_post);
            $search_post-permalink = get_permalink($search_post-ID);

            $data[] = $search_post;
        }

        $search_term = $_POST['content']['s'];

        $resp = array(
            'success'   = true,
            'data'      = array(
                'posts'     = $data,
                'total'         = $query-found_posts,
                'count'         = $query-post_count,
                'pages'         = $query-max_num_pages,
                'search_term'   = $search_term
            )
        );
    } catch (Exception $e) {
        $resp = array(
            'success' = false
        );
    }
    wp_send_json($resp);
}

HTML AJAX Template:

script type="text/template" id="search_preview"
# _.each(posts, function(search_post){ #
div class="item-search"
    a href="{{= search_post.permalink }}"
        {{= search_post.post_title.replace( search_term, 'p' + search_term + "/p" ) }}
    /a
/div
# }); #

I successfully make ajax search for posts it's working fine now I need to include the search for users and tags in the search results like Facebook can search tags and users and pages at the same time.

I can search for users only or for tags only but I failed to merge all the results.

Anyone can help me on this?