You may be able to get more results by adjusting your search query.

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