posts_search 中的自定义查询

如何使用此查询作为我的自定义搜索查询？

add_filter('posts_search', 'my_search_is_perfect', 20, 2);
function my_search_is_perfect($search, $wp_query) 
{
   $sWord = 'Zukunft haus';

   return "
       SELECT *, 
              MATCH(post_title) AGAINST('$sWord' IN BOOLEAN MODE) AS Score 
        FROM `wp_posts` 
       INNER JOIN wp_term_relationships ON wp_term_relationships.object_id = ID
             AND wp_term_relationships.term_taxonomy_id = 1
       WHERE MATCH( post_title) AGAINST ('$sWord' IN BOOLEAN MODE) 
         AND `post_status` = 'publish'
         AND `post_type` = 'post'
       ORDER BY score DESC
  "; 
}

查询是正确的（我在 phpMyAdmin 中检查过），但在 WordPress 中我收到消息，没有结果。

在 function.php 文件中：

add_filter('posts_search', 'my_search_is_perfect', 20, 2);
function my_search_is_perfect() 
{
    global $post;
    global $wpdb;
    $sWord = 'Zukunft haus';

    $sel_query = "SELECT *, 
                          MATCH(post_title) AGAINST('$sWord' IN BOOLEAN MODE) AS Score 
                    FROM ".$wpdb->prefix."posts 
                   INNER JOIN ".$wpdb->prefix."term_relationships ON ".$wpdb->prefix."term_relationships.object_id = ID
                         AND ".$wpdb->prefix."term_relationships.term_taxonomy_id = 1
                   WHERE MATCH( post_title) AGAINST ('$sWord' IN BOOLEAN MODE) 
                     AND post_status = 'publish'
                     AND post_type = 'post'
                   ORDER BY score DESC";
    $totaldata = $wpdb->get_results($sel_query);

    return $totaldata;
}