I have been using Google's "Site Search" facility for over seven years. As of June 16, 2015, it is no longer functioning.
The Google Search team says, "We are experiencing some technical issues with the website, and our engineers are working quickly to resolve the issue to get the site up and running again."
In the meantime, I would recommend you use regular Google to search this site, using this example search format:
TheObamaFile.com Obama education
"TheObamaFile.com" finds this website, and "education" finds all the stuff related to Obama's education.
You can also use the site index to find much of what you are searching for.
I apologize for the inconvenience, but this is out of my hands.