Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
keyes practical » keys practical, key practical, feces practical
patrick moocs » patrick moore, patrick mons, patrick moyes
patrick mayen » patrick bayer, patrick madan, patrick moyes
patrick keyes » patrick moyes, patrick kelly, patrick bayer

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( the ((patrick moocs) OR (patrick mayen)) practical astronomy surveys ) OR ( the patrick keyes practical astronomy surveys )).
• Adding a wildcard symbol may retrieve word variants: (( the ((patrick moocs) or (patrick mayen)) practical astronomy surveys ) or ( the patrick keyes practical astronomy surveys ))*.