Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
moocs practical » books practical, mics practical, colts practical
astronomy seven » astronomy some, astronomy science, astronomy between
moore nautical » board nautical, mile nautical, moore national
patrick moocs » patrick mons, patrick moyes, patrick moore's

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 seven ) OR ( the patrick moore nautical astronomy seven )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy seven ) or ( the patrick moore nautical astronomy seven ))*.