We have some document control documents that are not showing up when searched for based on certain keywords but are for others....
The document title (as well as name) contain "Program Code1 Code2 Desc". So for example it might say "11123# ABC U1234 red thing".
The person doing the searching usually wants to get all of the files that relate to the codes. So they would search for "ABC U1234". The library has 6 documents that should match, but returns only 2 (Advanced search returns the same 2 results). However, if for example you search for "ABC U1234 red", the document that didn't show up in the first search now shows up. So I know the crawler has at least got the documents based on that (the document also have not been changed in several months, so it isn't like the title just changed and the crawler just hasn't hit it yet).
These are Excel documents