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