"langlands program" (pure mathematics thing): yup, top result is indeed related to the Langlands program, though it isn't obviously what anyone would want as their first result for that search. Not bad.
"asmodeus" (evil spirit in one of the deuterocanonical books of the Bible, features extensively in later demonology, name used for an evil god in Dungeons & Dragons, etc.): completely blank page, no results, no "sorry, we have no results" message, nothing. Not good.
"clerihew" (a kind of comic biographical short poem popular in the late 19th / early 20th century): completely blank page. Not good.
"marlon brando" (Hollywood actor): first few results are at least related to the actor -- good! -- but I'd have expected to see something like his Wikipedia or IMDB page near the top, rather than the tangentially related things I actually god.
"b minor mass" (one of J S Bach's major compositions): nothing to do with Bach anywhere in the results; putting quotation marks around the search string doesn't help.
"top quark" (fundamental particle): results -- of which there were only 7 -- do seem to be about particle physics, and in some cases about the top quark, but as with Marlon Brando they're not exactly the results one would expect.
"ferrucio busoni" (composer and pianist): blank page.
"dry brine goose" (a thing one might be interested in doing at this time of year): five results, none relevant; top two were about Untitled Goose Game.
"alphazero" (game-playing AI made by Google): blank page. Putting a space in results in lots of results related to the word "alpha", none of which has anything to do with AlphaZero.
OK, let's try some more mainstream things.
"harry potter": blank page. Wat. Tried again; did give some results this time. They are indeed relevant to Harry Potter, though the unexpected first-place hit is Eric Raymond's rave review of Eliezer Yudkowsky's "Harry Potter and the Methods of Rationality", which I am fairly sure is not what Google gives as its first result for "harry potter" :-).
"iphone 12" (confession: I couldn't remember what the current generation was, and actually this is last year's): top results are all iPhone-related, but first one is about the iPhone 6, second is from 2007, this is about the iPhone 6, fourth is from 2007, fifth is about the iPhone 4S, etc.
"pfizer vaccine": does give fairly relevant-looking results, yay.