I searched for "fzf-share"
(exact string match) and got back no results. After I realised I had safe search on, I disabled it and got the expected results.
I would expect to get back the results even while safe search is enabled, since they were SFW webpages: GitHub, the NixOS wiki, SFW sub-Reddits, and a couple of personal blogs.
What's maybe also interesting is that DuckDuckGo does not return results either (both in safe and unsafe mode), whereas Google gives back the expected answers by default.