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• If you are trying to use Boolean operators, they must be ALL CAPS: (((\ practical OR \ practice) 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)) OR (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 OR \ practice) guide to statistics AND epidemiology.\ ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((\ practical OR \ practice) 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)) OR (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 OR \ practice) guide to statistics and epidemiology.\ ))~".
• Adding a wildcard symbol may retrieve word variants: (((\ practical OR \ practice) 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)) OR (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 OR \ practice) guide to statistics and epidemiology.\ ))*.