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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)) AND epidemiology.\ ) OR (((\ practical guidebook to ((statistical OR statistical) OR (statistical OR statistical)) AND epidemiology.\ ) OR (((\ practical guide to ((statistical OR statistical) OR (statistical OR statistical)) AND epidemiology.\ ) OR (((\ practical guide to (((statistical OR statistical) OR (statistical OR statistical)) OR ((statistical OR statistical) OR (statistical OR statistical))) AND epidemiology.\ ) OR (\ practical guide to ((statistical OR statistical) OR (statistical OR statistical)) 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)) AND epidemiology.\ ) OR (((\ practical guidebook to ((statistical OR statistical) OR (statistical OR statistical)) AND epidemiology.\ ) OR (((\ practical guide to ((statistical OR statistical) OR (statistical OR statistical)) AND epidemiology.\ ) OR (((\ practical guide to (((statistical OR statistical) OR (statistical OR statistical)) OR ((statistical OR statistical) OR (statistical OR statistical))) AND epidemiology.\ ) OR (\ practical guide to ((statistical OR statistical) OR (statistical OR statistical)) AND epidemiology.\ ))))))))) OR (\ practice guide to statistics AND epidemiology.\ ))*.