Perhaps you should try some spelling variations:
optical astronomy » nautical astronomy, spherical astronomy
moore positional » aware positional, pure positional, whole positional
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
meek practical » meets practical, work practical, talk practical
risk practical » risk political
patrick mkie » patrick mackie, patrick mein, patrick m
mkie optical » moire optical, mode optical, more 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 mkie optical astronomy sergey ) OR ( the patrick ((meek practical) OR (risk practical)) astronomy sergey )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the patrick moore positional astronomy sergey ) or ((( the patrick mkie optical astronomy sergey ) or ( the patrick ((meek practical) OR (risk practical)) astronomy sergey ))))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moore positional astronomy sergey ) or ((( the patrick mkie optical astronomy sergey ) or ( the patrick ((meek practical) OR (risk practical)) astronomy sergey ))))*.