See Search is too Specific (click on link)

Try a general (Any Type) search instead of one of the specific type searches if you're having problems. The search chain can only be so large. Also if you make the search criteria too narrow, then it has less chance of finding results. There's other ways of getting results. Such as looking for an artist or album & then browsing those that show results. Or for video, searching a producer or main actor's name. You can also use Bitzi lookup to find out if it's listed & if yes, see what other names it's listed under. You can go to the Bitzi site & use their search engine to search their database.