Perhaps you should try some spelling variations:
decrease operation » decrease cooperation (Expand search), decrease migration (Expand search), decrease predation (Expand search)
operation patterns » operating patterns (Expand search), population patterns (Expand search), alteration patterns (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 of » decrease in (Expand search)
of decrease » or decrease (Expand search), not decrease (Expand search), to 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 AND decrease akt decrease ) OR ( decrease of decrease operation patterns ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease AND decrease akt decrease ) OR ( decrease of decrease operation patterns ))*.