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 OR practice) guidebook to ((((statistical OR statistical) OR (statistical OR statistical)) OR ((statistical OR statistical) OR (statistical OR statistical))) OR ((statistical OR statistical) OR (statistical OR statistical))) AND epidemiology.\ ) OR (\ (practical OR practice) guide to statistics AND epidemiology.\ ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\ (practical OR practice) guidebook to ((((statistical OR statistical) OR (statistical OR statistical)) OR ((statistical OR statistical) OR (statistical OR statistical))) OR ((statistical OR statistical) OR (statistical OR statistical))) and epidemiology.\ ) OR (\ (practical OR practice) guide to statistics and epidemiology.\ ))~".
• Adding a wildcard symbol may retrieve word variants: ((\ (practical OR practice) guidebook to ((((statistical OR statistical) OR (statistical OR statistical)) OR ((statistical OR statistical) OR (statistical OR statistical))) OR ((statistical OR statistical) OR (statistical OR statistical))) and epidemiology.\ ) OR (\ (practical OR practice) guide to statistics and epidemiology.\ ))*.