Perhaps you should try some spelling variations:
increase risk » increased risk (Expand search)
risk decrease » risk decreases (Expand search), risk increase (Expand search), break decrease (Expand search)
in professors » and professors (Expand search), of professors (Expand search), _ professors (Expand search)
decrease with » decreases with (Expand search), increase with (Expand search), decrease the (Expand search)
with decrease » with decreased (Expand search), with deceased (Expand search), with increase (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( increase risk decrease in professors ) OR ( decrease to decrease with decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( increase risk decrease in professors ) OR ( decrease to decrease with decrease ))*.