Uninstaller not finding any leftovers.

Has anyone been having problems with Uninstaller not find leftover files?

Every time I run Uninstaller to search for leftovers the app never seems to find anything and I know that is not true. For example, I installed LibreOffice, and then dragged the App to the trash and emptied it. Run Uninstaller for leftovers, and if did not find the files left in Library/Application Support

The Uninstaller App used to be great as finding leftover files as such, but no so anymore?

Any suggestions?

Thanks in advance.

Stan