There is a test page reserved for admins exactly for the purpose of experimenting with LIST syntax:
Or if you want to find just one type of object try
If you get no results at all (and you know for sure you have stuff with "test" in it, or tracker items) then you probably need to rebuild your search index. Go to Settings -> Control Panels -> Search (or Admin -> Search in previous versions) and click "rebuild". Then try your search again.