For example, suppose you want to find out what`s been said about "hot dog stands."
In the Google query line, type:
site:www.startupnation.com hot dog stands
Note that you type this into the actual query box, not the URL address line of your browser. (And of course, you`ll have to be at that Google site.)
The critical part is: site:www.startupnation.com
Whatever you type after that is the actual search phrase or word.
(This works on any site, actually, but it helps a lot with SuN.)