Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
practical economy » political economy, practices economic, practical anatomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
moocs practical » mics practical, abcs practical, ics practical
economy studies » economic studies, economy stupid
modes practical » models practical, model practical, codes practical
patrick moocs » patrick moore, patrick mons, patrick moyes
patrick modes » patrick moyes, patrick mons, trick modes

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 practical economy studies ) OR ( the patrick modes practical astronomy surveys )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical economy studies ) or ( the patrick modes practical astronomy surveys ))*.