Perhaps you should try some spelling variations:
optical astronomy » nautical astronomy, spherical astronomy, positional astronomy
astronomy series » gastronomy services, astronomy survives, astronomy studies
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
moore optical » moire optical, more optical, core optical

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 moore optical astronomy series ) OR ( the patrick moore optical astronomy sergey ))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moore optical astronomy series ) OR ( the patrick moore optical astronomy sergey ))*.