Perhaps you should try some spelling variations:
practical astronomy » optical astronomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
astronomy sergey » astronomy survey, astronomy large, astronomy society
moore positional » aware positional, pure positional, whole positional
moore practical » more practical, moocs practical, mouse practical
astronomy seven » astronomy some, astronomy science, astronomy between
moore nautical » board nautical, mile nautical, moore national

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