No trick - just not currently supported. I use Postgresql full text search, and haven't researched how to handle c++ or c#. The only sophistication baked into the search are wildcard queries and title vs. description ranking.

I'm aware of the limitations and want to fix them. If any HNers know what I should search for on Google to get this done, please let me know.

don't know about postgres but, just write a function that converts c++ into cpp (many use cpp too). Store that. Then on search do the same thing, c++ becomes cpp.

probably simplest fix...

That's smart. And c# -> csharp. I love HackerNews.