you can use notedeck to pull down data by visiting your profile page. once you have your data locally you can search it
on macOS you have to do:
ndb -d ~/Library/Application\ Support/notedeck/db
to use the notedeck db
on linux its:
ndb -d ~/.local/share/notedeck/db
you can also do something more manually by using `ndb import` and pulling data from the relay. import is kinda buggy right now though when importing lots of data.