Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy surveying » astronomy during
astronomy survives » astronomy survey, astronomy surveys, astronomy studies
moocs practical » mics practical, does practical, drops practical
patrick moocs » patrick moore, patrick mons, patrick moyes
patrick dale » patrick case, patrick calder, patrick bayer
patrick de » patrick d, patrick dr, patrick d.d

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