Searching for (Keith AND Kieth) OR blablablabla instead returns pages with Keith OR Kieth OR blablablabla
Adding quotes around search terms does not help ("Keith" AND "Kieth") OR blablablabla
Fixing this will greatly help those searching pages for spelling errors - e.g. search for (Kingdon AND Kingdom) should return pages where someone would have used the word Kingdom (perhaps) more than once, having (perhaps) misspelled the word as Kingdon at least once but it would filter out pages that are for people with the last name Kingdon.