Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
practice astronomy » practica astronomy, practice autonomy, practica astrology
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
patrick moocs » patrick moore, patrick mons, patrick moore's
patrick moyes » patrick keyes, patrick mayen, patrick mons
key practice » key practices, day practice, my practice
patrick key » patrick kelly, patrick kenny, patrick keyes

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) OR (patrick moyes)) practical astronomy surveys ) OR ( the patrick key practice astronomy surveys )).
• Adding a wildcard symbol may retrieve word variants: (( the ((patrick moocs) or (patrick moyes)) practical astronomy surveys ) or ( the patrick key practice astronomy surveys ))*.