I recently needed to find some files (MS Word which contained a specific word). From Windows Explorer, I selected the root of the directory in which I thought the files resided, entered the word I wanted to find in the Search box, and 16 files were found.
I then repeated the search using a stand-alone search tool and it found several hundred files.
I looked at the search options and they ARE configured to search the directory in question and MS Word documents. (Since some files were found, it seems reasonable to assume that the search options are configured properly.) It also reported that my system was fully indexed.
Why does Windows Search fail to find files being sought?