For reasons I won't try to uncover, "AMI" is a restricted term in Google SafeSearch. If you have SafeSearch turned on, and you search for "amazon linux ami," Google will helpfully remove "ami" and search only for "amazon linux."
The word "ami" has been filtered from the search because Google SafeSearch is active.
Luckily, Google will also helpfully correct your spelling, so search instead for "amazon linux amih" and it will show you the results you were looking for.
Showing results for amazon linux ami
Search instead for amazon linux amih
I'm sure there are nefarious things a young person might do with this bit of know-how, but I won't elaborate.