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 » books practical, mics practical, colts practical
modes practical » models practical, model practical, codes practical
does practical » notes practical, does practice, globes practical
patrick modes » patrick moyes, patrick mons, trick modes

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 (does practical)) astronomy series ) OR ( the patrick modes practical astronomy series )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick ((moocs practical) or (does practical)) astronomy series ) or ( the patrick modes practical astronomy series ))*.