Ugh, yes. Google is still pretty good for navigation-by-title on popular content, but it is increasingly terrible at search. Breaking operators is part of that story, but I've seen more and more instances where Google will prove that it can return a page but won't return results for some of the phrases on the page. I half suspect that behind the scenes there is a one-hot encoding or embedding that just ignores tokens with low frequency, which completely wrecks Google's ability to navigate technical writing with abbreviations, part numbers, small brands, etc. Sometimes it does work, so I think of it like a popularity algorithm plus a decrepit fallback for the content it deems "no longer necessary" to do a half decent job on.