Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy survey » astronomy surveys, autonomy survey, astronomy surveying
astronomy sergey » astronomy surveys, astronomy large, astronomy society
moocs practical » mics practical, abcs practical, ics practical
astronomy seven » astronomy some, astronomy science, astronomy between
moyes practical » modes practical, movies practical, moraes practical
moocs nautical » hoc nautical, logs nautical, nos nautical
patrick moocs » patrick moore, patrick mons, patrick moore's
patrick moyes » patrick keyes, patrick mayen, patrick mons

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