You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: \ (( practical guidebook to ((biostatistics OR biostatistical) OR biostatistical) AND epidemiology.\\ ) OR ( practical guide to statistical AND epidemiology.\\ ))*\~.

Perhaps you should try some spelling variations:
"\ practical guidebook to biostatistics OR biostatistical OR biostatistical AND epidemiology.\\ OR practical guide to statistical AND epidemiology.\\ *\ » "\ practice guidebook to biostatistics OR biostatistical OR biostatistical AND epidemiology.\\ OR practice guide to statistical AND epidemiology.\\ *\ (Expand Search), "\ practical guidebook to statistics OR biostatistical OR biostatistical AND epidemiology.\\ OR practical guide to statistical AND epidemiology.\\ *\ (Expand Search)