For WP_Query(), you don’t need to add the % before and after the keyword when using LIKE as comparison. WP_Query() will handle it for you. If you add %, WP_Query() thinks that you want to add that character itself to the search. That’s the first reason you don’t see any results.
The second problem is that if you have the query as above, the $search_term need to match (post title OR post content) AND (meta field english_title OR english_content).
You can use $wpdb() to search instead of WP_Query() because sometimes WP_Query() is limited for customisation like that.
Please follow the tutorial given here: https://adambalee.com/search-wordpress-by-custom-fields-without-a-plugin/
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