I will frequently search for z foo bar z, get documents that have synonyms of foo and bar (and the synonyms will be highlighted in the snippet), then I will search "foo" "bar" and get the same documents except now it doesn't highlight the synonyms in the snippet. Maybe I am in some awful cohort where this feature is intentionally broken to see if it reduces engagement.
They used to have a bug with those
Same here, but seems to be 30/70. 30% of the time it works.
A while ago I was looking at an odd NetBSD issue and searched using "NetBSD". I got a few results on top, but most of the results on the first page were OpenBSD without any mention of NetBSD.
Once you get your query dialed in, prepare to take the Turing test.