Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy survives » astronomy survey, astronomy surveys, astronomy studies
astronomy during » astronomy dialling, astronomy meeting, economy during
moocs practical » books practical, mics practical, colts practical
patrick moocs » patrick moore, patrick mons, patrick moyes
de nautical » _ nautical, a nautical, 2 nautical
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 nautical ((astronomy surveying) OR (astronomy during)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the patrick moocs practical astronomy survives ) or ( the patrick de nautical ((astronomy surveying) OR (astronomy during)) ))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy survives ) or ( the patrick de nautical ((astronomy surveying) OR (astronomy during)) ))*.