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