Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy large
astronomy seven » astronomy some, astronomy science, astronomy between
more practical » some practical
more nautical » mile nautical, some nautical, board 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 seven ) OR ( the patrick more nautical astronomy sergey )).
• Adding a wildcard symbol may retrieve word variants: (( the patrick more practical astronomy seven ) or ( the patrick more nautical astronomy sergey ))*.