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 maxton » patrick barron, patrick hamilton
patrick moyes » patrick mayen, patrick mons, patrick moore's
patrick keyes » patrick kelly, patrick bayer, patrick kenny

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 moyes) OR (patrick maxton)) practical astronomy surveys ) OR ( the patrick keyes practical astronomy surveys )).
• Adding a wildcard symbol may retrieve word variants: (( the ((patrick moyes) or (patrick maxton)) practical astronomy surveys ) or ( the patrick keyes practical astronomy surveys ))*.