Perhaps you should try some spelling variations:
decreases caries » decreases cardiac (Expand search), decreases cancer (Expand search), decreases aedes (Expand search)
caries affected » are affected (Expand search), patients affected (Expand search)
rats decreases » and decreases (Expand search), but decreases (Expand search), stress decreases (Expand search)
decrease rats » decreased rate (Expand search), decreases rate (Expand search), decrease at (Expand search)
decrease toc » decrease of (Expand search), decrease the (Expand search), decreased to (Expand search)
toc decrease » to decrease (Expand search), the decrease (Expand search), not decrease (Expand search)
decrease or » decrease of (Expand search), decrease pro (Expand search), decrease in (Expand search)
or decrease » of decrease (Expand search), not decrease (Expand search), to decrease (Expand search)

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: (( decrease toc decrease OR decrease ) OR ( decrease rats decreases caries affected ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease toc decrease or decrease ) OR ( decrease rats decreases caries affected ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease toc decrease or decrease ) OR ( decrease rats decreases caries affected ))*.