Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
moore practical » more practical, moocs practical, mouse practical
gene positional » game positional, gene position, guenon positional
anne positional » cancer positional, after positional, aware positional
patrick gene » patrick glenn, patrick penel, patrick geddes
patrick anne » patrice anne, patricia anne, patrick finney

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