What query did you do, specifically, and what kind of HTTPS libraries are you looking for?
If I do [ https ] almost all links on the SERP contain the literal string HTTPS.
If I do [ "https" ] every link on the SERP contains the literal string HTTPS.
In both cases, the results are nearly worthless. So, you must be trying something like
[ "https" libraries ]
Again, that returns only moderately relevant results (all the matches contain https literal text, but it's not a nice list of https libraries).
Being more specific is going to guide the engine to understand your intent more clearly. For example [ "https" programming library for C++ ] finds a nice list of HTTPS libraries, including this link about half-way down (personally, I would prefer that was on top):
C/C++ libraries for HTTP programming - Stack Overflow stackoverflow.com/questions/.../c-c-libraries-for-http-programming Sep 15, 2010 - C/C++ libraries for HTTP programming [duplicate] ... What well known C/C++ libraries are out there that could allow one to implement servlets, or at least provide most of the essentials for .... Self contained http/https library ...
Note the search engine noticed the page has https text in it, even though the title does not. The page points at libcurl, which seems like a good answer.
Another detail is that there are both server and client libraries for https, you should probably specify which you want:
[ "https" client library for c++ ]
and in fact, that SERP is pretty great (first two links are both great starting points).
- is still an operator and excludes words so you could say:
-http -public
Likewise you have
intitle:
filetype:
ext:
intext:
allintitle:
allintext: