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