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