Perhaps you should try some spelling variations:
work effectively » more effectively (Expand search), to effectively (Expand search), are effectively (Expand search)
decrease work » decrease or (Expand search), increase work (Expand search), decrease of (Expand search)
decrease akt » decrease and (Expand search), decrease after (Expand search), decrease with (Expand search)
akt decrease » and decrease (Expand search), not decrease (Expand search), any decrease (Expand search)
decrease at » decrease and (Expand search), decrease of (Expand search), decrease _ (Expand search)
at decrease » rate decrease (Expand search), that decrease (Expand search), and decrease (Expand search)
in decrease » in decreased (Expand search), on decrease (Expand search), pain decrease (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 akt decrease at decrease ) OR ( decrease in decrease work effectively ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease akt decrease at decrease ) OR ( decrease in decrease work effectively ))*.