Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy
optical astronomy » nautical astronomy
moore positional » aware positional, pure positional, whole positional
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
meek practical » meets practical, risk practical, work practical
patrick mkie » patrick mackie, patrick mein, patrick m
patrick meek » patrick meier, patrick mein, 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 moore positional astronomy sergey ) OR ((( the patrick mkie ((optical astronomy) OR (spherical astronomy)) sergey ) OR ( the patrick meek 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 mkie ((optical astronomy) OR (spherical astronomy)) sergey ) or ( the patrick meek practical astronomy sergey ))))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moore positional astronomy sergey ) or ((( the patrick mkie ((optical astronomy) OR (spherical astronomy)) sergey ) or ( the patrick meek practical astronomy sergey ))))*.