Perhaps you should try some spelling variations:
decrease risk » decreased risk (Expand search), increase risk (Expand search), decrease in (Expand search)
risk decrease » risk decreases (Expand search), risk increase (Expand search), break decrease (Expand search)
decrease toc » decrease of (Expand search), decreased to (Expand search), decrease on (Expand search)
toc decrease » to decrease (Expand search), the decrease (Expand search), not decrease (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (Expand search)
the quantity » the quality (Expand search), the identity (Expand search), the quantum (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: "(( decrease risk decrease NOT decrease ) OR ( decrease toc decrease the quantity ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease risk decrease NOT decrease ) OR ( decrease toc decrease the quantity ))*.