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

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

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