Gnutella programs such as LW cannot search the entire gnutella network at once. And although some people with the file may be within your search horizon, they may be dial up users & possibly be skipped over.

My advice is to use the Advanced search option. Right-click the search results tab, choose advanced -> Get More Results.

Keep in mind people come & go offline on the network all the time.

Also, sometimes you may connect thru a particular Ultrapeer that is not responding properly. Options are to restart LW hoping you find new ultrapeers or ban the ones you know definitely are duds. But I warn to be careful of doing that.

It's also best to let LW settle after opening, before using the search function.