Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy surveying » astronomy during
astronomy survives » astronomy survey, astronomy surveys, astronomy studies
moocs practical » books practical, mics practical, colts practical
patrick moocs » patrick moore, patrick mons, patrick moyes
de spherical » _ spherical, 2 spherical, 3 spherical
patrick de » patrick d, patrick dr, patrick dale

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 de spherical astronomy surveying )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy survives ) or ( the patrick de spherical astronomy surveying ))*.