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) OR (practical guide)) to biostatistical AND epidemiology.\") OR (\"((practical guidebook) OR (practical guide)) to statistical AND epidemiology.\"))) OR (\"practice guide to statistics AND epidemiology.\"))".
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((((\\"((practical guidebook) OR (practical guide)) to biostatistical and epidemiology.\\") OR (\\"((practical guidebook) OR (practical guide)) to statistical and epidemiology.\\"))) OR (\\"practice guide to statistics and epidemiology.\\"))\"".
• Removing quotes may allow a broader search: (((( ((practical guidebook) OR (practical guide)) to biostatistical and epidemiology. ) OR ( ((practical guidebook) OR (practical guide)) to statistical and epidemiology. ))) OR ( practice guide to statistics and epidemiology. )).