Topic: Composite "source:" argument in search queries?

Is there a way to do composite "-source:" search queries removing both twitter and furaffinity?

Having tried queries like..
artist -source:twi -source:furaffinity
artist -source:twi||furaffinity
artist -source:twi||source:furaffinity
artist -source:twi||-source:furaffinity
artist -source:"twi"||"furaffinity" (and single quotes too)

In the first case, only have the last "-source" was working, aka overwriting the previous one, else it just didn't work. Adding/changing || and &&s here and there to test too.

Updated by Mairo