Perhaps you should try some spelling variations:
astronomy series » astronomy sergey, gastronomy services, astronomy survives
core spherical » case spherical, pole spherical, some spherical
moore optical » moire optical, more optical, moon optical
core optical » mode optical, large optical
patrick core » patrick corr, patrick moore, patrick corsi

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