I'm shocked they don't have a filter for that. If you input an obscure term with no common misspellings it should be the main key used. Instead they just omit

I'm shocked they don't have a filter for that. If you input an obscure term with no common misspellings it should be the main key used. Instead they just omit it entirely. They do seem introspective enough to include a "must include this word" link in the results.