Visit
http://www.powersearchingwithgoogle.com/course/apsYou can target your searches by typing in the Search box a combination of:
Intitle
Inurl
Site:

site:nasa.gov inurl history ultralight —> will look into domain nasa.gov and then directory within domain.

Special characters:
+
%
$
#

work and have meaning – but all in their own ways. Duplicates are dropped.

Other special characters are ignored.