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