Deactivate "safe search" (Score 2, Informative)

I initially got abysmal results (no result found for just about anything I searched for, like the very technical "implicit volumes" or "queyras")

Then I deactivated "safe search" and finally obtained some results. However I suspect my original good impression I had of having found "relevant" (authoritative?) results in the first place were due to the safe search being on.