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) 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) and epidemiology.\\\\") OR (\\\\"practical guide to statistical and epidemiology.\\\\"))*\\\"\\"\"".
• Removing quotes may allow a broader search: \ ((\\ practical guidebook to (biostatistical OR statistics) and epidemiology.\\ ) OR (\\ practical guide to statistical and epidemiology.\\ ))*\.