Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, positional astronomy
optical astronomy » nautical astronomy, spherical astronomy, positional astronomy
astronomy series » astronomy sergey, gastronomy services, astronomy survives
moocs practical » mics practical, does practical, drops practical
moore practical » more practical, mouse practical, course practical
moyes practical » modes practical, movies practical, moraes practical
patrick moocs » patrick mons, patrick moore's
moocs optical » moon optical, topics optical, dots optical
patrick moyes » patrick keyes, patrick mayen, patrick mons

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 moore practical astronomy series ))) OR ( the patrick moocs optical astronomy series ))) OR ( the patrick moyes 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 moore practical astronomy series ))) or ( the patrick moocs optical astronomy series ))) or ( the patrick moyes practical astronomy series ))".
• Adding a wildcard symbol may retrieve word variants: (((((( the patrick moocs practical astronomy series ) OR ( the patrick moore practical astronomy series ))) or ( the patrick moocs optical astronomy series ))) or ( the patrick moyes practical astronomy series ))*.