Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy surveys » astronomy surveying, astronomy survives, autonomy survey
astronomy sergey » astronomy seven, astronomy large, astronomy society
astronomy survey » autonomy survey, astronomy surveying, astronomy survives
moore practical » moocs practical, mouse practical, course practical
more practical » some practical
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 practical astronomy sergey ) OR ( the patrick more practical ((astronomy survey) OR (astronomy surveys)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the patrick moore practical astronomy sergey ) or ( the patrick more practical ((astronomy survey) OR (astronomy surveys)) ))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moore practical astronomy sergey ) or ( the patrick more practical ((astronomy survey) OR (astronomy surveys)) ))*.