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
patrick moraes » patrick moyes, patrick moore's, patrick moore
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 moraes practical astronomy series )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy series ) or ( the patrick moraes practical astronomy series ))*.