Perhaps you should try some spelling variations:
practical astronomy » optical astronomy
astronomy survey » astronomy surveys, autonomy survey, astronomy surveying
astronomy sergey » astronomy surveys, astronomy seven, astronomy large
moore practical » more practical, moocs practical, mouse practical
moore nautical » board nautical, mile nautical, moore national
patrick mkie » patrick mackie, patrick mein, patrick m.m
patrick m » patrick _, patrick a

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