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) 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: "\"\\"\\\"((\\\"((practice 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: \ ((\ ((practice guidebook) OR (practical guide)) to (biostatistical OR (biostatistics OR statistics)) and epidemiology.\\ ) OR (\ practice guide to statistical and epidemiology.\\ ))*\.