Perhaps you should try some spelling variations:
practical astronomy » optical astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy large
moore practical » more practical, moocs practical, mouse practical
mkie positional » case positional, game positional, gene positional
astronomy seven » astronomy some, astronomy science, astronomy between
moore nautical » board nautical, mile nautical, moore national
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 nautical astronomy sergey ))) 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 nautical astronomy sergey ))) 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 nautical astronomy sergey ))) or ( the patrick mkie positional astronomy seven ))*.