Why? Google is lousy for searching forums unless you're searching for an exact phrase.
Google does not have any direct concept of separation between posts. It can only approximate "search for these keywords in one single post" by preferring keywords that are in close proximity.
“The egg hatched...” “...the egg hatched... and a hundred baby spiders came out...” (blade runner)
“Who are you?” “A friend. I'm here to prevent you from making a mistake.” “You have no idea what I'm doing here, friend.” “In specific terms, no, but I swore an oath to protect the world...” (continuum)
“It's a goal you won't understand until later. Your job is to make sure he doesn't achieve the goal.” (bsg)