resignation anon posted this in the QuestForSearchability thread. I didn't know about it, and I figured most others didn't either.
https://resignation.info/scripts/8chan/search.php
There's also a search available here:
http://q-questions.info/research-tool.php
and here
https://www.pavuk.com
I was looking at doing a bread search but I'll probably drop it to do other things. All the good search engines require dedicated hosting in order to install as a service. My cheap assed hosting isn't going to work for anything.