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