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 OR \"practice) guidebook to ((biostatistics OR statistical) OR (biostatistics 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 ((biostatistics OR statistical) OR (biostatistics OR statistical)) and epidemiology.\\\") OR ((\\"practical OR \\"practice) guide to statistics and epidemiology.\\\"))\\"\"".
• Removing quotes may allow a broader search: ((( practical OR practice) guidebook to ((biostatistics OR statistical) OR (biostatistics OR statistical)) and epidemiology.\ ) OR (( practical OR practice) guide to statistics and epidemiology.\ )).