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• The words AND, OR and NOT may confuse the search; try adding quotes: "\"\\"((\\\"practical guidebook to (((biostatistical OR statistics) OR (biostatistical OR statistics)) OR (biostatistical OR statistics)) AND epidemiology.\\\") OR (\\\"practical guide to statistical AND epidemiology.\\\"))~\\"\"".
• Removing quotes may allow a broader search: ((\ practical guidebook to (((biostatistical OR statistics) OR (biostatistical OR statistics)) OR (biostatistical OR statistics)) AND epidemiology.\ ) OR (\ practical guide to statistical AND epidemiology.\ ))~.