Perhaps you should try some spelling variations:
practical astronomy » optical astronomy, positional astronomy
astronomy sergey » astronomy survey, astronomy surveys, astronomy seven
moore practical » more practical, moocs practical, mouse practical
moore nautical » board nautical, mile nautical, moore national
mkie practical » more practical, made practical, make practical
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 practical astronomy sergey )).
• 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 practical astronomy sergey ))".
• 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 practical astronomy sergey ))*.