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

• If you are trying to use Boolean operators, they must be ALL CAPS: \ \\ ((((((\\\ practical guidebook to ((biostatistical OR statistical) OR (biostatistical OR statistical)) AND epidemiology.\\\ ) OR (\\\ practical guidebook to (biostatistical OR statistical) AND epidemiology.\\\ ))) OR (((\\\ practice guidebook to ((biostatistical OR statistical) OR (biostatistical OR statistical)) AND epidemiology.\\\ ) OR (\\\ practice guidebook to (biostatistical OR statistical) AND epidemiology.\\\ ))))) OR (\\\ practical guide to statistics AND epidemiology.\\\ ))*\\~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "\ \\ ((((((\\\ practical guidebook to ((biostatistical OR statistical) OR (biostatistical OR statistical)) and epidemiology.\\\ ) OR (\\\ practical guidebook to (biostatistical OR statistical) and epidemiology.\\\ ))) OR (((\\\ practice guidebook to ((biostatistical OR statistical) OR (biostatistical OR statistical)) and epidemiology.\\\ ) OR (\\\ practice guidebook to (biostatistical OR statistical) and epidemiology.\\\ ))))) OR (\\\ practical guide to statistics and epidemiology.\\\ ))*\\~".
• Adding a wildcard symbol may retrieve word variants: \ \\ ((((((\\\ practical guidebook to ((biostatistical OR statistical) OR (biostatistical OR statistical)) and epidemiology.\\\ ) OR (\\\ practical guidebook to (biostatistical OR statistical) and epidemiology.\\\ ))) OR (((\\\ practice guidebook to ((biostatistical OR statistical) OR (biostatistical OR statistical)) and epidemiology.\\\ ) OR (\\\ practice guidebook to (biostatistical OR statistical) and epidemiology.\\\ ))))) OR (\\\ practical guide to statistics and epidemiology.\\\ ))*\\*.