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

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 course practical astronomy sergey ) OR ( the patrick moyes practical astronomy sergey )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick course practical astronomy sergey ) or ( the patrick moyes practical astronomy sergey ))*.