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