I stumbled upon this little gem, a search engine called Symbol Hound that unlike Google, doesn't ignore symbols in fast it is actually optimised for searching with them. It only searches within Stack Overflow but that means it's very focused on programming and really if you're not finding your answer to a programming operator question on SO, it deserves to be asked.
For a long time now I've searched Google using quotes around the term for things like C# "+= operator" hoping that it would work this time. Finally searching for symbols should be a breeze :)