Which version of LW are you using? If you connect to different ultrapeers (hosts that you connect to, to help you search) then that can change the search results that you see. Give that a try & see if it makes any difference.

LW 4: Click on the Connections tab. There you'll see the UPs that you're connected to. Right click on a host > remove... another host will take it's place.
LW 5: Click on Tools > Advanced Tools. From there you can remove hosts by right click > remove.

Otherwise, try refining your search.
LW 4: On the search page, click on 'Audio'. Tick the box beside 'More Search Options' & add any info that you can think of.
LW 5: Click on the 'All' button (beside 'Search') > Advanced Search > Audio. Add details from there.

Sometimes, an 'All Types' search can yield different results to an Audio search - so give that a try as well. And don't forget to search at different times of day... as people in different countries log on & off, files available on the network change.
Sorry if you've already tried all this

There are more tips here: How to find music