After further testing, I found that if you miss-spell a word in the search query, it will return the proper results.

Searching "jfk ecret societies" (missing the "s") returns the proper results - https://i.imgur.com/wzthTte.png

However when you spell it all properly ("jfk secret societies") - you don't get any results that are actually JFKs speech.

It's as if the search term (no-typos) has been completely blacklisted/modified.