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

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

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