When you can't imagine, you're stuck with searching, searching that comes in many forms, such as scanning catalogs, walking aisles, or letting someone else do it altogether.

If you can imagine what you want and describe it with sufficient language, you can have someone else (or something) go and fetch it for you, but you're still stuck with the problem of not getting _exactly_ what you want, so again, you must parse the results... or get stuck with whatever is returned first.

Ad the end of the day, it's a question of how much you care about getting the thing you want vs getting something that is close enough, and the answer is in how much effort you, personally, want to spend.