Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy surveys » astronomy surveying, astronomy survives, astronomy sergey
astronomy survey » astronomy sergey, autonomy survey, astronomy surveying
moocs practical » books practical, mics practical, colts practical
moraes nautical » moraes practical
patrick moraes » patrick moyes, patrick moore's, patrick moore
patrick moocs » patrick moore, patrick mons, patrick moyes

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 moraes nautical astronomy surveys )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy survey ) or ( the patrick moraes nautical astronomy surveys ))*.