Perhaps you should try some spelling variations:
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)
act effectived » act effectively (Expand search), not effective (Expand search), it effective (Expand search)
decrease not » decrease of (Expand search), decrease akt (Expand search), decrease at (Expand search)
not decrease » to decrease (Expand search), not increase (Expand search), and decrease (Expand search)
decrease act » decrease akt (Expand search), decrease at (Expand search), decreased akt (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 _ decrease NOT decrease ) OR ( decrease during decrease act effectived ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease _ decrease not decrease ) OR ( decrease during decrease act effectived ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease _ decrease not decrease ) OR ( decrease during decrease act effectived ))*.