Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy surveys » astronomy surveying, astronomy survives, astronomy sergey
astronomy survey » astronomy sergey, autonomy survey, astronomy surveying
moocs practical » mics practical, does practical, drops practical
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 practical astronomy surveys ) OR ( the patrick moocs practical astronomy survey ))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy surveys ) OR ( the patrick moocs practical astronomy survey ))*.