Finder search fails for Excel numbers as text

I have a problem with Finder. When searching certain number copied from one excel file in order to find other excel files, which may include such number - it is giving only few results, while I know that there are many more. I think the problem is that MacOS cannot find the this number if it is stored as text in other excel files. Windows searches files like that with no problem. Anyone has the same issue? any solutions? I have tried re-indexing did not help.