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 ((biostatistics OR biostatistical) OR biostatistical) 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 ((biostatistics OR biostatistical) OR biostatistical) and epidemiology.\\ ) OR (\\ ((practice guide) OR (practical guide)) to statistical and epidemiology.\\ ))~\*".