Perhaps you should try some spelling variations:
optical astronomy » nautical astronomy, spherical astronomy, positional astronomy
astronomy studies » astronomy study, astronomy status, astronomy die
astronomy series » astronomy sergey, gastronomy services, astronomy survives
optical economy » poltical economy, political economy, optimal economic
economy studies » economic studies, economy stupid
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 moore optical astronomy studies ) OR ( the patrick moore optical economy studies )))).
• 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 studies ) OR ( the patrick moore optical economy studies ))))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moore optical astronomy series ) or ((( the patrick moore optical astronomy studies ) OR ( the patrick moore optical economy studies ))))*.