You may limit the search results by content sources you have used in the project settings. You may also set rules for parent documents.
You may specify more than one source. If you set source names in a tree format, you should refer the same way.
parent: Search by parent content. ZIPs or folders may have other content under them. if you take a note, then it becomes a child of the content.
child: search by child content. e.g. search files whose note contains “eligible”.