Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
moocs positional » holds positional, blocks positionals, images positional
kelly practical » key practical, daily practical, easy practical
patrick moocs » patrick moore, patrick mons, patrick moyes
patrick kelly » patrick allo

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