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