Perhaps you should try some spelling variations:
decrease buffer » decrease after (Expand search), decrease burden (Expand search), decrease suffering (Expand search)
buffer effects » buffer effect (Expand search), after effects (Expand search), under effects (Expand search)
treg decrease » the decrease (Expand search), urea decrease (Expand search), drugs decrease (Expand search)
decrease treg » decrease the (Expand search), decrease their (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)
decrease of » decrease in (Expand search)
of decrease » or decrease (Expand search), not decrease (Expand search), of decree (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 to decrease of decrease ) OR ( decrease treg decrease buffer effects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease to decrease of decrease ) OR ( decrease treg decrease buffer effects ))*.