Perhaps you should try some spelling variations:
optical astronomy » nautical astronomy, spherical astronomy
moore positional » aware positional, pure positional, whole positional
astronomy sergey » astronomy surveys, astronomy seven, astronomy large
astronomy survey » astronomy surveys, autonomy survey, astronomy surveying
patrick more » patrick moyes, patrick mkie, patrick mark
more optical » moire optical, mode 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 positional astronomy sergey ) OR ( the patrick more optical astronomy survey )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick moore positional astronomy sergey ) or ( the patrick more optical astronomy survey ))*.