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