Search Post By Tag

/* Search Post By Tag */
function add_tag_live_search( $statement ) {
    $new_statement = array(
        'tax_query' => array(
            'relation' => 'OR',
            array(
                'taxonomy' => 'name',
                'field'    => 'slug',
                'terms'    => $statement['s'],
            ),
            array(
                'taxonomy' => 'post_tag',
                'field'    => 'slug',
                'terms'    => str_replace( ' ', '-', $statement['s'] ),
            ),
            array(
                'taxonomy' => 'post_tag',
                'field'    => 'slug',
                'terms'    => str_replace( ' ', '+', $statement['s'] ),
            ),
        ),
    );
    unset($statement['s']);

    return array_merge( $statement, $new_statement );
}
add_filter( 'jnews_live_search_args', 'add_tag_live_search' );