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