Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy science » astronomy space, astronomy ancient
astronomy sergey » astronomy survey, astronomy surveys, astronomy large
mkie positional » game positional, gene positional, iv positional
astronomy seven » astronomy some, astronomy between, astronomy section
case positional » waste positional, game positional, cancer positional
patrick more » patrick moore, patrick moyes, patrick mark
patrick mkie » patrick mackie, patrick mein, patrick moore
patrick case » patrick fraser, patrick a, patrick c

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