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