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