I think that any aviation related search engine that does allow you to search for a TLA (Three Letter Acronym) is next to useless. It excludes many, many schools and essential items of kit:
AFT, OAT, FTE, QAC.
ILS, NDB, AFD, VSI, ASI, ADI, VOR, QFE, QNH etc. etc. etc.
That does not help anyone.