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

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