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