Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy series » astronomy sergey, gastronomy services, astronomy survives
moocs practical » mics practical, abcs practical, ics practical
astronomy seven » astronomy some, astronomy science, astronomy between
mons practical » coins practical, lens practical, owens practical
does practical » notes practical, does practice, globes practical
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 series ) OR ( the patrick ((mons practical) OR (does practical)) astronomy seven )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the patrick moocs practical astronomy series ) or ( the patrick ((mons practical) OR (does practical)) astronomy seven ))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moocs practical astronomy series ) or ( the patrick ((mons practical) OR (does practical)) astronomy seven ))*.