TBH the Google search engine is amazing and is a default for 99% of computer users these days
They EXPECT to be able to type in something close and get an answer - Unfortuately SQL etc are a lot older and far less flexible
Not much you can do TBH - the data is right, you've got a data entry policy, you correct mistakes when you find them
Unless and until you can deploy some software that can carry out an intelligent trawl and recategorise the whole thing you've done what you can