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