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