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

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