Perhaps you should try some spelling variations:
astronomy surveying » astronomy during
astronomy surveys » astronomy survey, astronomy survives, astronomy sergey
moocs nautical » moocs practical, hoc nautical, logs nautical
patrick moocs » patrick moore, patrick mons, patrick moyes

You may be able to get more results by adjusting your search query.

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