If I’m looking for something Microsoft related, I use www.google.com/microsoft.  This will filter my results to Microsoft type answers.  If I search for SMS, I’ll get Systems Management Server instead of Short Messaging Services.  They also have a filtered search for the U.S. Government at www.google.com/ig/usgov as well as others.  If you want your answers to come from a specific website like Microsoft.com or you only want to search military websites, after your search criteria enter site:microsoft.com or site:mil.