Copy this code to your theme’s functions.php and it will return posts in search result also by their category/tag name.
This snippet is one of the most useful I’ve ever used. It allows you to fully customize the shown columns in the posts screen, whether it’s a regular ‘post’ type or a custom one. Adding a new column Step 1/2 – add the column to the column list & set its label Line 1: manage_post_posts_columns = […]