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