Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy large
moocs practical » books practical, mics practical, colts practical
astronomy seven » astronomy some, astronomy science, astronomy between
patrick moocs » patrick moore, patrick moyes, patrick moore's
mons nautical » nos nautical, hoc nautical, mile nautical
logs nautical » nos nautical, hoc nautical, some nautical
patrick mons » patrick moyes, patrick bond, patrick mpondo
patrick logs » patrick lord, patrick l.s, patrick love

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