Perhaps you should try some spelling variations:
decrease looping » decrease flooding (Expand search), decrease lodging (Expand search), decrease owing (Expand search)
decrease during » increase during (Expand search), increases during (Expand search), increased during (Expand search)
during decrease » during increased (Expand search), during depressed (Expand search), during disease (Expand search)
decrease drugs » disease drugs (Expand search), decrease treg (Expand search), release drugs (Expand search)
drugs decrease » drugs increases (Expand search), drugs release (Expand search)
looping effect » looping effects (Expand search), flooding effect (Expand search), doping effect (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)

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 during decrease ) OR ( decrease drugs decrease looping effect ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease and decrease during decrease ) OR ( decrease drugs decrease looping effect ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease and decrease during decrease ) OR ( decrease drugs decrease looping effect ))*.