Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
moocs practical » mics practical, abcs practical, ics practical
moyes practical » modes practical, movies practical, moraes practical
mayen practical » man practical, modern practical, seven practical
patrick moocs » patrick moore, patrick mons, patrick moore's
patrick moyes » patrick keyes, patrick mons, patrick moore's
patrick mayen » patrick bayer, patrick madan, patrick maxton

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