Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy surveys » astronomy surveying, astronomy survives, autonomy survey
moore positional » pure positional, whole positional, more positioning
astronomy sergey » astronomy seven, astronomy large, astronomy society
aware positional » aware position, swarm positional, aware conditional
astronomy survey » autonomy survey, astronomy surveying, astronomy survives
more practical » some practical
patrick aware » patrick edward, patrick andrew, patrick bajari
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 moore positional astronomy sergey ) OR ( the patrick aware positional astronomy surveys ))) OR ( the patrick more practical astronomy survey )).
• Adding a wildcard symbol may retrieve word variants: (((( the patrick moore positional astronomy sergey ) or ( the patrick aware positional astronomy surveys ))) or ( the patrick more practical astronomy survey ))*.