Perhaps you should try some spelling variations:
risk decreases » diet decreases (Expand search), life decreases (Expand search), oic decreases (Expand search)
decreases treg » decrease treg (Expand search), decreases the (Expand search), decreases stress (Expand search)
decrease risk » decreased risk (Expand search), increase risk (Expand search), decrease with (Expand search)
treg decrease » the decrease (Expand search), urea decrease (Expand search), drugs decrease (Expand search)
decrease not » decrease of (Expand search), decrease akt (Expand search), decrease at (Expand search)
not decrease » to decrease (Expand search), not increase (Expand search), and decrease (Expand search)
in objects » in object (Expand search), on objects (Expand search), and objects (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 risk decreases treg decrease ) OR ( decrease NOT decrease in objects ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease risk decreases treg decrease ) OR ( decrease not decrease in objects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease risk decreases treg decrease ) OR ( decrease not decrease in objects ))*.