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• The words AND, OR and NOT may confuse the search; try adding quotes: "\ ((\\ practical guidebook to ((((statistical OR statistical) OR (statistical OR statistical)) OR ((statistical OR statistical) OR (statistical OR statistical))) OR ((statistical OR statistical) OR (statistical OR statistical))) AND epidemiology.\\ ) OR (((\\ practical guide to statistics AND epidemiology.\\ ) OR (\\ practice guide to statistics AND epidemiology.\\ ))))~".
• Adding a wildcard symbol may retrieve word variants: \ ((\\ practical guidebook to ((((statistical OR statistical) OR (statistical OR statistical)) OR ((statistical OR statistical) OR (statistical OR statistical))) OR ((statistical OR statistical) OR (statistical OR statistical))) AND epidemiology.\\ ) OR (((\\ practical guide to statistics AND epidemiology.\\ ) OR (\\ practice guide to statistics AND epidemiology.\\ ))))*.