Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
course practical » yourself practical, concise practical, use practical
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
moraes practical » more practical, movies practical, modes practical
moyes practical » modes practical, movies practical, notes practical
patrick course » patrick corsi, patrick case, patrick count

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 astronomy sergey\\") or (\\"the patrick ((moyes practical) OR (moraes practical)) astronomy sergey\\"))\"".
• Removing quotes may allow a broader search: (( the patrick course practical astronomy sergey ) or ( the patrick ((moyes practical) OR (moraes practical)) astronomy sergey )).