Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
more positional » more positioning, aware positional, more conditional
pure positional » aware positional, pure conditional, pure rotational
more practical » some practical
patrick more » patrick moore, patrick moyes, patrick mkie

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((\\"the patrick more practical astronomy sergey\\") or (\\"the patrick ((more positional) OR (pure positional)) astronomy sergey\\"))\"".
• Removing quotes may allow a broader search: (( the patrick more practical astronomy sergey ) or ( the patrick ((more positional) OR (pure positional)) astronomy sergey )).