Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy surveys » astronomy survey, astronomy surveying, astronomy survives
astronomy sergey » astronomy survey, astronomy large, astronomy society
moore practical » more practical, moocs practical, mouse practical
mkie positional » case positional, game positional, gene positional
astronomy seven » astronomy some, astronomy science, astronomy between
mein positional » benign positional, non positional, gene positional
patrick mkie » patrick mackie, patrick m, patrick m.m
patrick mein » patrick madan, patrick m, patrick m.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 surveys ))) OR ((( the patrick mkie positional astronomy seven ) OR ( the patrick mein 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 surveys ))) or ((( the patrick mkie positional astronomy seven ) OR ( the patrick mein positional astronomy seven ))))".
• Adding a wildcard symbol may retrieve word variants: (((( the patrick moore practical astronomy sergey ) or ( the patrick moore practical astronomy surveys ))) or ((( the patrick mkie positional astronomy seven ) OR ( the patrick mein positional astronomy seven ))))*.