Please read the Site conventions first if you haven't done so already.
Lets say you are searching for a specific term or terms because you don't know what they mean. Google can help you find a definition:
google: define:<terms>
How about when you want to find something on a forum? It is known that some forums have a very bad search engine and finding something is just impossible. Here is a solution:
google: site:<the forum here> <search query here>
