If I wanted to search about the phrase "Poor man's X",
The question When did the expression "Poor man's <noun>" originate? appears when I search for
But if I use quotes
I get three hits, but not the optimal hit.
Removing the apostrophe and the "s" doesn't help
I get six hits, but not the optimal hit.
Why do I get sub-optimal search results when using quotes? Is this related to the apostrophe?