Perhaps you should try some spelling variations:
optical astronomy » nautical astronomy, spherical astronomy, positional astronomy
astronomy series » astronomy sergey, gastronomy services, astronomy survives
charge spherical » charged spherical, hard spherical, shape spherical
core spherical » cfrp spherical, coma spherical, pole spherical
case spherical » based spherical, class spherical, can spherical
moore optical » moire optical, more optical, core optical

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