Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy studies » astronomy study, economy studies, astronomy status
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
moyes practical » modes practical, movies practical, moraes practical
patrick moocs » 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) OR (patrick moore)) practical astronomy studies ) OR ( the patrick moyes practical astronomy surveys )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the ((patrick moocs) OR (patrick moore)) practical astronomy studies ) or ( the patrick moyes practical astronomy surveys ))".
• Adding a wildcard symbol may retrieve word variants: (( the ((patrick moocs) OR (patrick moore)) practical astronomy studies ) or ( the patrick moyes practical astronomy surveys ))*.