Perhaps you should try some spelling variations:
decrease operational » increase operational (Expand search), disease operational (Expand search), decrease cooperation (Expand search)
operational process » operational processes (Expand search), operacional processos (Expand search), operational problems (Expand search)
decrease akt » decrease at (Expand search), decrease and (Expand search), decrease after (Expand search)
akt decrease » and decrease (Expand search), any decrease (Expand search), salt decreases (Expand search)
decrease not » decrease of (Expand search), decrease at (Expand search), decrease on (Expand search)
not decrease » to decrease (Expand search), not increase (Expand search), and decrease (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 operational process ) OR ( decrease akt decrease NOT decrease ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease _ decrease operational process ) OR ( decrease akt decrease not decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease _ decrease operational process ) OR ( decrease akt decrease not decrease ))*.