Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy large
moocs practical » mics practical, abcs practical, ics practical
astronomy seven » astronomy some, astronomy science, astronomy between
patrick moocs » patrick moore, patrick mons, patrick moyes
n nautical » _ nautical, a nautical, 2 nautical
patrick n » patrick _, patrick a, patrick d

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 n 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 n 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 n nautical astronomy sergey ))*.