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