Perhaps you should try some spelling variations:
decrease their » increase their (Expand search), decreases the (Expand search)
their decrease » the decrease (Expand search), their disease (Expand search), the decreased (Expand search)
treg decrease » the decrease (Expand search), urea decrease (Expand search), drugs decrease (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (Expand search)
the defence » the defense (Expand search), the reference (Expand search), the defensive (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( decrease NOT decrease treg decrease ) OR ( decrease their decrease the defence ))~.