How do I avoid collections and different versions of the games? When I search, I select only GAMES in the options, but really often I find multiple collections, packs, bundles, and different versions of the games, like deluxe, silver, gold, premium, and so on, even if I didn't check the bundle option. How to avoid this?

By the way, I have suggestions on how to improve the searching engine (a few modifications to make it better), where should I post my suggestions to Steam (Valve) to receive them?