Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy series » astronomy sergey, gastronomy services, astronomy survives
patrick moyes » patrick keyes, patrick mayen, patrick mons
patrick mark » patrick marx, patrick burk, patrick meek

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