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: "\"\\"((\\"practice guidebook to ((biostatistical OR biostatistics) OR (biostatistical OR biostatistics)) AND epidemiology.\\\") OR (\\"practice guide to statistics AND epidemiology.\\\"))\\"\"".
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"\\"\\\"((\\\"practice guidebook to ((biostatistical OR biostatistics) OR (biostatistical OR biostatistics)) and epidemiology.\\\\") OR (\\\"practice guide to statistics and epidemiology.\\\\"))\\\"\\"\"".
• Removing quotes may allow a broader search: \ ((\ practice guidebook to ((biostatistical OR biostatistics) OR (biostatistical OR biostatistics)) and epidemiology.\\ ) OR (\ practice guide to statistics and epidemiology.\\ ))\.