Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
moyes practical » modes practical, movies practical, moraes practical
more positional » pure positional, monkey positional, aware positional
patrick moyes » patrick keyes, patrick mayen, patrick mons
patrick more » patrick moore, patrick mkie, patrick mark

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 practical astronomy sergey ) OR ( the patrick more positional astronomy sergey )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moyes practical astronomy sergey ) or ( the patrick more positional astronomy sergey ))*.