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
dale nautical » mile nautical, tables nautical, a nautical
patrick dale » patrick case, patrick de, patrick calder

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