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 to biostatistics AND epidemiology.\ ) OR (\ practical guide to statistics AND epidemiology.\ ))~".
• Adding a wildcard symbol may retrieve word variants: ((\ practice guidebook to biostatistics AND epidemiology.\ ) OR (\ practical guide to statistics AND epidemiology.\ ))*.