I still think many are missing OP's point. This is not about general search engines, or general billboard adverts, it's about the search function within a specific store (Home Depot, Amazon, O'Reilly Auto Parts, etc).
You are at their store and searching because you are looking for something specific. If you don't find it easily, you may go onto one of their competitors. If I'm searching for 2 x 4's, don't show me a bunch of 24" window shades. Some seem to be about that bad.
I know exactly what OP means, but it's hard to recall examples after the fact, because I've moved on. Maybe I'll come up with some to illustrate.