Perhaps you should try some spelling variations:
images positional » images conditional, images positioning, leagues positional
moocs positional » holds positional, blocks positionals, points positional
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
patrick images » patrick chames, patrol images, backtrack images
patrick moocs » patrick moore, patrick mons, patrick moyes

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the patrick moocs positional astronomy sergey ) OR ( the patrick images positional astronomy sergey ))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs positional astronomy sergey ) OR ( the patrick images positional astronomy sergey ))*.