Comment by MobiusHorizons

I think you would have much better results if you can search for a full word rather than a single character. You are treating it like a substring matches, and that’s not the job it is doing. Full text search engines handle misspellings of words or even similar phrases. Quoting like you have done would produce more favorable results, but I don’t think it works on less than a word. Is there a word or phrase you could use instead?