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

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