If a user's offline, you can't see any of their files.
What you're seeing might be fake files, there are lots around. They'll sit 'connecting' for ages before going straight to 'need more sources'. Typically, these are new releases (though not always) with large numbers of sources (up to 100). Try varying your search terms... look for artist or album rather than song title. Also try the All Types search. Stay away from files with huge numbers of sources, I go for files with 10 sources or less