Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
optical astronomy » nautical astronomy, spherical astronomy
moore positional » aware positional, pure positional, whole positional
astronomy sergey » astronomy survey, astronomy seven, astronomy large
patrick more » patrick moyes, patrick mark, patrick marx
patrick mkie » patrick mackie, patrick mein, patrick m

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) OR (patrick mkie)) ((practical astronomy) OR (optical astronomy)) survey )).
• 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) or (patrick mkie)) ((practical astronomy) OR (optical astronomy)) survey ))".
• 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) or (patrick mkie)) ((practical astronomy) OR (optical astronomy)) survey ))*.