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