Perhaps you should try some spelling variations:
decrease yield » decreases yield (Expand search), increase yield (Expand search), increases yield (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)
yield pattern » yield after (Expand search), yield water (Expand search), yield protein (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)
decrease or » decrease of (Expand search), decrease on (Expand search), decrease pro (Expand search)
or decrease » not decrease (Expand search), to decrease (Expand search), _ 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 AND decrease OR decrease ) OR ( decrease treg decrease yield pattern ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease and decrease or decrease ) OR ( decrease treg decrease yield pattern ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease and decrease or decrease ) OR ( decrease treg decrease yield pattern ))*.