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 (biostatistical OR statistical)) OR ((biostatistics OR (biostatistical OR statistical)) OR (biostatistical OR statistical))) OR ((biostatistics OR (biostatistical OR statistical)) 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 (biostatistical OR statistical)) OR ((biostatistics OR (biostatistical OR statistical)) OR (biostatistical OR statistical))) OR ((biostatistics OR (biostatistical OR statistical)) 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 (biostatistical OR statistical)) OR ((biostatistics OR (biostatistical OR statistical)) OR (biostatistical OR statistical))) OR ((biostatistics OR (biostatistical OR statistical)) OR (biostatistical OR statistical))) and epidemiology.\ ) OR (\ practical guide to statistics and epidemiology.\ ))*.