I know a file is available somewhere on the internet for download whose exact name I know, e.g. abc-def-ghi.pdf. If I enter the filename into the Google search box, Google does not find it.
I found the file by searching Google for text which is contained in the file. From this Google search, I can download the file. Also, later I can download the file again just by entering the URL found by Google search.
How though can I use Google to search for web pages where this file is available for download?