Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy series » astronomy sergey, gastronomy services, astronomy survives
moraes practical » more practical, movies practical, modes practical
moocs practical » books practical, mics practical, colts practical
moyes practical » modes practical, movies practical, notes practical
patrick moocs » patrick moore, patrick mons, patrick moyes

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