Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy between » antinomy between, economy between
astronomy sergey » astronomy survey, astronomy surveys, astronomy large
moocs practical » books practical, mics practical, colts practical
moore practical » more practical, mouse practical, course practical
astronomy seven » astronomy some, astronomy science, astronomy section
moocs nautical » hoc nautical, logs nautical, nos nautical
patrick moocs » patrick mons, patrick moyes, patrick moore's

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