Try LIKE
multiple time:
SELECT * FROM post
WHERE title LIKE '%some%'
AND title LIKE '%good%'
See this SQLFiddle
You can also join both tables like this:
SELECT post.post_id, title FROM Post
RIGHT JOIN Tags
ON post.post_id = tags.post_id
WHERE Tags.value IN ('some','good')
GROUP BY post.Post_ID
HAVING COUNT(*)>1;
See this SQLFiddle
Note: If we don't use HAVING
clause, It will also return records where any single value exists