Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, positional astronomy
astronomy surveying » astronomy during
astronomy surveys » astronomy survey, astronomy survives, astronomy sergey
optical astronomy » nautical astronomy, spherical astronomy, positional astronomy
moocs practical » mics practical, abcs practical, ics practical
patrick moocs » patrick moore, patrick mons, patrick moyes
patrick dyes » patrick keyes, patrick moyes, patrick de
dyes optical » drives optical, modes optical, sizes optical

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 surveys ) OR ( the patrick dyes optical astronomy surveying )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy surveys ) or ( the patrick dyes optical astronomy surveying ))*.