This often happens because, for one thing spammers manage to put up fake files as results for any search you care to make. Also you need to play around with the search feature to find what gives you the best result. If you enter an artist and an album, I find you will get hundreds of totally irellevent results. Some have greater success using "all files" some The audio or video searches.
Also you may enter an artsts name say "Bill Smith" and you will get results for Buffalo Bill, Heating Bill, Bessie Smith, and so on. It might be a good idea to put the words Heating, Bessie etc into your word filter in options, you can always remove them at any time.
I hope this helps a bit
