Simplicity matters. It also helps to not run on the name. Generally everything on this site bears on intelligence so that is a useless search term in this special context.
Search 1: Walter Dorn (16 Posts)
Search 2: United Nations intelligence (over 100 hits most not directly related)
Search 3: United Nations (over 100 hits slightly more focused)
Dorn (under Top Authors Less Steele)