Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
astronomy sergey » astronomy survey, astronomy seven, astronomy large
moocs practical » books practical, mics practical, colts practical
patrick moocs » patrick moore, patrick moyes, patrick moore's
mons nautical » logs nautical, nos nautical, hoc nautical
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 moocs practical astronomy surveys ) OR ( the patrick mons nautical astronomy sergey )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy surveys ) or ( the patrick mons nautical astronomy sergey ))*.