I just saw the question Where does “Hello, World!” come from?, which is an exact duplicate of Where does ‘Hello world’ come from?, right down to the exact words in the title. Curious, I entered the first text into the ask-a-question box, and instead of suggesting the second post, it just said that wasn't a very good title:
without suggesting the obvious exact duplicate question.
I would suggest that even if (perhaps especially if) the title doesn't have any good words in it, that the automatic question search still populate the suggested question list with whatever comes up in the search?