sharepoint 2013 - Query search to _Layouts directory

Within SharePoint 2013 - I was able to create a query for a search that allows me to find pages in my current site collection....

{searchTerms} Path:https://my-site/

Through this same search tool, it is possible to query for custom .net pages that live under my _layouts directory as well? something like this...

{searchTerms} Path:https://my-site/_layouts/customfolder/

I am having trouble getting any results when I attempt to do that...

thanks for any advice on what I need to adjust in my search settings to get pages to show up.

...still stuck on this issue - any ideas on searching for external sources via _layouts directory?