Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy series » astronomy sergey, gastronomy services, astronomy survives
mons practical » coins practical, does practical, lens practical
moocs nautical » moocs practical, hoc nautical, logs nautical
patrick moocs » patrick moore, patrick moyes, patrick moore's
patrick mons » patrick moyes, patrick bond, patrick mpondo

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