Perhaps you should try some spelling variations:
made effective » more effective (Expand search), are effective (Expand search), safe effective (Expand search)
decrease treg » decrease the (Expand search), decrease their (Expand search)
treg decrease » the decrease (Expand search), urea decrease (Expand search), drugs decrease (Expand search)
decrease made » decrease model (Expand search), decrease age (Expand search), decreased base (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease the (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)
decrease of » decrease in (Expand search)
of decrease » or 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 of decrease treg decrease ) OR ( decrease AND decrease made effective ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease of decrease treg decrease ) OR ( decrease and decrease made effective ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease of decrease treg decrease ) OR ( decrease and decrease made effective ))*.