Perhaps you should try some spelling variations:
moocs positional » holds positional, blocks positionals, images positional
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
patrick moocs » patrick moore, patrick mons, patrick moyes
mile nautical » i nautical, ii nautical, some nautical
patrick mile » patrick miller, patrick riley, patrick maill

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 sergey ) OR ( the patrick mile nautical astronomy sergey )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs positional astronomy sergey ) or ( the patrick mile nautical astronomy sergey ))*.