Perhaps you should try some spelling variations:
optical astronomy » nautical astronomy, positional astronomy
astronomy series » gastronomy services, astronomy survives, astronomy studies
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
more spherical » smoke spherical, pole spherical, some spherical
mark spherical » smart spherical, hard spherical, rank spherical
moore optical » moire optical, more optical, core optical
patrick more » patrick moyes, patrick mkie, patrick marx
patrick mark » patrick marx, patrick burk, patrick meek

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