Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy surveys » astronomy surveying, astronomy survives, autonomy survey
astronomy sergey » astronomy large, astronomy society, astronomy space
astronomy survey » autonomy survey, astronomy surveying, astronomy survives
moore practical » more practical, moocs practical, mouse practical
mkie positional » case positional, game positional, gene positional
astronomy seven » astronomy some, astronomy science, astronomy between
patrick mkie » patrick mackie, patrick mein, patrick m

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 moore practical astronomy survey ))) OR ( the patrick moore practical astronomy surveys ))) OR ( the patrick mkie positional astronomy seven )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((((( the patrick moore practical astronomy sergey ) OR ( the patrick moore practical astronomy survey ))) or ( the patrick moore practical astronomy surveys ))) or ( the patrick mkie positional astronomy seven ))".
• Adding a wildcard symbol may retrieve word variants: (((((( the patrick moore practical astronomy sergey ) OR ( the patrick moore practical astronomy survey ))) or ( the patrick moore practical astronomy surveys ))) or ( the patrick mkie positional astronomy seven ))*.