Weird. Tried on multiple browsers on multiple computers, and it only ever returns zero results. To be clear, I'm not talking about the board search in the top right corner, which works fine. I'm talking about the one in the middle, just above the sticky posts. From here you should be able to enter a particular ticker, i.e. RCHAD (which has been mentioned multiple times today), and get all the posts on this board that mentioned it. I always get zero results.