Uploading similar material also helps. Also browse anybody (if possible) who might have something similar but exactly what you're after. They themselves may be connected to more people with similar files, then your searches may find more of the files you are after. Don't forget to use the 'Get More Results' function, as this helps to extend the horizon of the search a little.

Maximum Horizon of LW or a Gnutella client program, & perhaps http://www.gnutellaforums.com/new-ph...tml#post321136 (particularly GregorK's post #4) give a brief description of the limitations of searches for Gnutella programs.