Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy surveying » astronomy during
astronomy survives » astronomy survey, astronomy studies
astronomy surveys » astronomy survey, astronomy sergey, autonomy survey
moocs positional » holds positional, blocks positionals, images positional
moyes practical » movies practical, moraes practical, notes practical
modes practical » models practical, model practical, codes practical
patrick moocs » patrick moore, patrick mons, patrick moore's
patrick moyes » patrick keyes, patrick mayen, patrick mons
patrick modes » patrick mons, trick modes, patrick moore's

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 positional astronomy survives ) OR ((( the patrick moyes practical astronomy surveying ) OR ( the patrick modes practical astronomy surveys )))).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs positional astronomy survives ) or ((( the patrick moyes practical astronomy surveying ) or ( the patrick modes practical astronomy surveys ))))*.