Perhaps you should try some spelling variations:
optical astronomy » nautical astronomy, spherical astronomy, positional astronomy
astronomy series » astronomy sergey, gastronomy services, astronomy survives
patrick more » patrick moore, patrick moyes, patrick mark
patrick mkie » patrick mackie, patrick mein, patrick moore

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "the ((patrick more) OR (patrick mkie)) optical astronomy series".
• Adding a wildcard symbol may retrieve word variants: the ((patrick more) OR (patrick mkie)) optical astronomy series*.