Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
moore positional » aware positional, pure positional, whole positional
astronomy sergey » astronomy survey, astronomy seven, astronomy large
more practical » some practical
mark practical » market practical, smart practical, work practical
patrick more » patrick moyes, patrick mkie, patrick marx
patrick mark » patrick marx, patrick burk, patrick meek

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 moore positional astronomy sergey ) OR ( the patrick moore positional astronomy surveys ))) OR ((( the patrick more practical astronomy sergey ) OR ( the patrick mark practical astronomy sergey )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( the patrick moore positional astronomy sergey ) or ( the patrick moore positional astronomy surveys ))) or ((( the patrick more practical astronomy sergey ) OR ( the patrick mark practical astronomy sergey ))))".
• Adding a wildcard symbol may retrieve word variants: (((( the patrick moore positional astronomy sergey ) or ( the patrick moore positional astronomy surveys ))) or ((( the patrick more practical astronomy sergey ) OR ( the patrick mark practical astronomy sergey ))))*.