Right-click the top of the search results window bar & a menu will appear. Choose to show Client/Version. Then you'll be able to see what clients are offering the files. With some other clients, they're not always easy to connect to. Some of them connect simultaneously with other networks leaving no upload bandwidth left over for gnutella users. You can try downlding from them, but just be aware that sometimes it's difficult. If they didn't connect to other networks at the same time then fine.

Finding sources is the name of the game. So keep searching to see if you can find more people to downld from.