Perhaps you should try some spelling variations:
the preprocessing » the processing (Expand search), their processing (Expand search), image preprocessing (Expand search)
decrease walking » increase walking (Expand search), decrease during (Expand search), decrease lodging (Expand search)
walking decrease » walking decreases (Expand search), warming decreases (Expand search), taping decrease (Expand search)
decreases and » decreases in (Expand search), decreases _ (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (Expand search)
decrease akt » decrease at (Expand search), decrease and (Expand search), decrease after (Expand search)
akt decrease » not decrease (Expand search), any decrease (Expand search), salt decreases (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: (( decreases AND decrease the preprocessing ) OR ( decrease walking decrease akt decrease ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decreases and decrease the preprocessing ) OR ( decrease walking decrease akt decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decreases and decrease the preprocessing ) OR ( decrease walking decrease akt decrease ))*.