Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
moraes practical » more practical, movies practical, modes practical
moocs practical » mics practical, does practical, abcs practical
drops practical » does practical, drugs practical, aris practical
patrick moraes » patrick moyes, patrick moore's, patrick moore

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