Perhaps you should try some spelling variations:
practica astronomy » practical astronomy, practica astrology, practical astronomer
astronomy survey » astronomy surveys, astronomy sergey, autonomy survey
moore's nautical » moore's notices
moocs practica » moocs practical, mics practical
patrick moocs » 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 survey ) OR ( the patrick moore's nautical astronomy survey )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practica astronomy survey ) or ( the patrick moore's nautical astronomy survey ))*.