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) OR (practical guidebook)) to biostatistics AND epidemiology.\\ ) OR (\\ practical guide to statistics AND epidemiology.\\ ))*\~".
• Adding a wildcard symbol may retrieve word variants: \ ((\\ ((practice guidebook) OR (practical guidebook)) to biostatistics AND epidemiology.\\ ) OR (\\ practical guide to statistics AND epidemiology.\\ ))*\*.