Perhaps you should try some spelling variations:
decrease recurring » decrease during (Expand search), decrease replacing (Expand search), decrees referring (Expand search)
recurring problems » recoloring problems (Expand search), routing problems (Expand search), learning problems (Expand search)
decrease akt » decrease at (Expand search), decrease and (Expand search), decrease after (Expand search)
akt decrease » and decrease (Expand search), not decrease (Expand search), any decrease (Expand search)
decrease on » decrease in (Expand search), decrease of (Expand search), decrease or (Expand search)
on decrease » on decreased (Expand search), or decrease (Expand search), of 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 recurring problems ) OR ( decrease _ decrease on decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease akt decrease recurring problems ) OR ( decrease _ decrease on decrease ))*.