Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy survives » astronomy survey, astronomy studies
astronomy surveys » astronomy survey, astronomy surveying, astronomy sergey
moore positional » aware positional, pure positional, whole positional
moore practical » more practical, mouse practical, course practical
moocs practical » mics practical, does practical, drops practical
patrick moocs » patrick mons, patrick moyes, 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 moore practical astronomy survives ) OR ((( the patrick moore positional astronomy survives ) OR ( the patrick moore positional astronomy surveys ))))) OR ( the patrick moocs practical astronomy survives )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( the patrick moore practical astronomy survives ) or ((( the patrick moore positional astronomy survives ) OR ( the patrick moore positional astronomy surveys ))))) or ( the patrick moocs practical astronomy survives ))".
• Adding a wildcard symbol may retrieve word variants: (((( the patrick moore practical astronomy survives ) or ((( the patrick moore positional astronomy survives ) OR ( the patrick moore positional astronomy surveys ))))) or ( the patrick moocs practical astronomy survives ))*.