Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
yourself practical » your practical
course practical » concise practical, care practical, use practical
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
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 ((course practical) OR (yourself practical)) astronomy sergey\\") or (\\"the patrick more practical astronomy sergey\\"))\"".
• Removing quotes may allow a broader search: (( the patrick ((course practical) OR (yourself practical)) astronomy sergey ) or ( the patrick more practical astronomy sergey )).