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