试试这个

<?php
//List of tag slugs
$tags = array();

$posttags = get_the_tags();
if ($posttags) {
  foreach($posttags as $tag) {
    $tags[] = $tag->term_id; 
  }
}

$args = array(
    \'tag__in\' => $tags
    //Add other arguments here
);

// This query contains posts with at least one matching tag
$tagged_posts = new WP_Query($args);

echo \'<ul>\';
while ( $tagged_posts->have_posts() ) : $tagged_posts->the_post();
   // Check each single post for up to 3 matching tags and output <li>
   $tag_count = 0;
   $tag_min_match = 2;
   foreach ( $tags as $tag ) {
      if ( has_tag( $tag ) && $tag_count < $tag_min_match ) {
         $tag_count ++;
      }
   }
   if ($tag_count >= $tag_min_match) {
      //Echo list style here
      echo \'<li><a href="\'. get_permalink() .\'" title="\'. get_the_title() .\'">\'. get_the_title() .\'</a></li>\';
   }
endwhile;
wp_reset_query();
echo \'</ul>\';

代码将获取与当前帖子相关的所有标签，搜索具有类似标签的其他帖子，如果有2个或更多标签匹配，则返回帖子。

希望这有帮助。