Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
more practical » some practical
more nautical » some nautical, board nautical, more natural
mile nautical » i nautical, ii nautical, some nautical
patrick more » patrick moore, patrick moyes, patrick mkie

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