Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy
astronomy survives » astronomy survey, astronomy surveys, astronomy studies
optical astronomy » nautical astronomy, spherical astronomy
moocs practical » mics practical, does practical, drops practical
patrick moocs » patrick moore, patrick mons, patrick moyes
patrick dyes » patrick keyes, patrick moyes, patrick de

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 survives ) OR ( the patrick dyes ((optical astronomy) OR (positional astronomy)) surveying )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the patrick moocs practical astronomy survives ) or ( the patrick dyes ((optical astronomy) OR (positional astronomy)) surveying ))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy survives ) or ( the patrick dyes ((optical astronomy) OR (positional astronomy)) surveying ))*.