Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy sergey » astronomy surveys, astronomy seven, astronomy large
astronomy survey » astronomy surveys, autonomy survey, astronomy surveying
moocs practical » books practical, mics practical, colts practical
moore practical » more practical, mouse practical, course practical
patrick moocs » 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 sergey ) OR ((( the patrick moore practical astronomy sergey ) OR ( the patrick moore practical astronomy survey ))))) OR ( the patrick mons nautical astronomy sergey )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( the patrick moocs practical astronomy sergey ) or ((( the patrick moore practical astronomy sergey ) OR ( the patrick moore practical astronomy survey ))))) or ( the patrick mons nautical astronomy sergey ))".
• Adding a wildcard symbol may retrieve word variants: (((( the patrick moocs practical astronomy sergey ) or ((( the patrick moore practical astronomy sergey ) OR ( the patrick moore practical astronomy survey ))))) or ( the patrick mons nautical astronomy sergey ))*.