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

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