Perhaps you should try some spelling variations:
analytical astronomy » analytical taxonomy, statistical astronomy, optical astronomy
practical astronomy » optical astronomy, positional astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
moocs practical » books practical, mics practical, colts practical
patrick moocs » patrick moore, patrick mons, patrick moyes
logs nautical » nos nautical, hoc nautical
some nautical » some practical, some critical, some natural
patrick logs » patrick lord, patrick l.s, patrick love
trick some » tricks some, track some, kick some

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 logs nautical astronomy sergey ) OR ((( the trick some nautical astronomy sergey ) OR ( the trick some analytical astronomy sergey )))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the patrick moocs practical astronomy sergey ) or ((( the patrick logs nautical astronomy sergey ) or ((( the trick some nautical astronomy sergey ) OR ( the trick some analytical astronomy sergey ))))))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy sergey ) or ((( the patrick logs nautical astronomy sergey ) or ((( the trick some nautical astronomy sergey ) OR ( the trick some analytical astronomy sergey ))))))*.