Perhaps you should try some spelling variations:
practica astronomy » practical astronomy, practica astrology, practical astronomer
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
moraes nautical » moraes practical
moocs practica » moocs practical, mics practical
patrick moraes » patrick moyes, patrick moore's, patrick moore
patrick moocs » patrick moore, patrick mons, patrick moyes

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 moocs practica astronomy sergey ) OR ( the patrick moraes nautical astronomy sergey )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practica astronomy sergey ) or ( the patrick moraes nautical astronomy sergey ))*.