Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy
optical astronomy » nautical astronomy, spherical astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
more positional » pure positional, more positioning, aware positional
more practical » some practical
moore optical » more optical, core optical, moon optical
patrick moire » patrick mkie, patrick meir, patrick moore's
moire optical » more optical, core optical, fibre optical
patrick more » patrick moyes, patrick mkie, patrick mark

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