I was looking for the post that contained "pre-Civil-War" so I entered that in the search. It didn't find it. It found two others.
One had Civil War in it (without the hyphen).
The other one was even weirder. It had Cold War and pre-trained. So I guess it found "War" (even though it wasn't Civil War) and "pre-" (even though it wasn't pre-Civil).
But it never found the post with the exact match.