I sometimes have bad search days. I think it might be related to ultrapeers you're connected to.

Go to LW's menu bar, View menu -> Show Hide Connections. Then right-click heading bar & tick option to show vendor/version. Select one (if any) that are not LW version 4.18, then press Remove button at bottom of window. Even if all 4.18, select one anyway & do that. Now wait for LW to find another ultrapeer to connect to .. wait until LW stabilizes its connection. Then go & try a search again. You may need to repeat this process.

The thing about how LW works is .. a search will only find a certain % of the entire network. It therefore depends on ultrapeers you are connected to to get results you are looking for.

Keep in mind also, some ultrapeers are actually spammers & some are just poor functioning ultrapeers.