You may be able to get more results by adjusting your search query.

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