Perhaps you should try some spelling variations:
in preprocessing » in reprocessing (Expand search), and preprocessing (Expand search), via preprocessing (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 the » decreases the (Expand search)
the decrease » to decrease (Expand search), and decrease (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 akt decrease in preprocessing ) OR ( decrease of decrease the decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease akt decrease in preprocessing ) OR ( decrease of decrease the decrease ))*.