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 survives") OR ((("the patrick moore positional astronomy survey") OR ((("the patrick moore positional astronomy surveying") OR ("the patrick pure positional astronomy surveying"))))))) OR ("the patrick moocs practical astronomy survives")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"the patrick moore practical astronomy survives\") or (((\"the patrick moore positional astronomy survey\") or (((\"the patrick moore positional astronomy surveying\") OR (\"the patrick pure positional astronomy surveying\"))))))) or (\"the patrick moocs practical astronomy survives\"))".
• Removing quotes may allow a broader search: (((( the patrick moore practical astronomy survives ) or ((( the patrick moore positional astronomy survey ) or ((( the patrick moore positional astronomy surveying ) OR ( the patrick pure positional astronomy surveying ))))))) or ( the patrick moocs practical astronomy survives )).
• Adding a wildcard symbol may retrieve word variants: (((("the patrick moore practical astronomy survives") or ((("the patrick moore positional astronomy survey") or ((("the patrick moore positional astronomy surveying") OR ("the patrick pure positional astronomy surveying"))))))) or ("the patrick moocs practical astronomy survives"))*.