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

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 (astronomy large)) ) OR ( the patrick moore practical 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 (astronomy large)) ) or ( the patrick moore practical astronomy seven ))) or ( the patrick moore positional astronomy surveys ))".
• Adding a wildcard symbol may retrieve word variants: (((( the patrick moore practical ((astronomy sergey) OR (astronomy large)) ) or ( the patrick moore practical astronomy seven ))) or ( the patrick moore positional astronomy surveys ))*.