Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy survey » astronomy surveys, autonomy survey, astronomy surveying
astronomy sergey » astronomy surveys, astronomy seven, astronomy large
moocs practical » mics practical, does practical, drops practical
patrick moocs » patrick moore, patrick mons, patrick moyes
logs nautical » nos nautical, hoc nautical, some nautical
patrick logs » patrick lord, patrick l.s, patrick love
patrick some » patrick sole, trick some, patrick souper

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 survey ) OR ((( the patrick logs nautical astronomy sergey ) OR ( the ((patrick some) OR (patrick home)) nautical astronomy sergey )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the patrick moocs practical astronomy survey ) or ((( the patrick logs nautical astronomy sergey ) or ( the ((patrick some) OR (patrick home)) nautical astronomy sergey ))))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy survey ) or ((( the patrick logs nautical astronomy sergey ) or ( the ((patrick some) OR (patrick home)) nautical astronomy sergey ))))*.