Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, positional astronomy
optical astronomy » nautical astronomy, spherical astronomy, positional astronomy
patrick colts » patrick colm, patrick bolton, patrick count
patrick mons » patrick moyes, patrick bond, patrick mpondo

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