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

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

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