Perhaps you should try some spelling variations:
the preprocessing » the processing (Expand search), their processing (Expand search), image preprocessing (Expand search)
decreased pain » decreases pain (Expand search), decreased brain (Expand search), decreased point (Expand search)
pain decrease » can decrease (Expand search), taping decrease (Expand search), strain decrease (Expand search)
decrease the » decreases the (Expand search), decrease of (Expand search)
in decreased » is decreased (Expand search), in deceased (Expand search), and decreased (Expand search)
decrease or » decrease of (Expand search), decrease on (Expand search), decrease pro (Expand search)
or decrease » of decrease (Expand search), not decrease (Expand search), to 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 OR decrease the preprocessing ) OR ( decrease in decreased pain decrease ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease or decrease the preprocessing ) OR ( decrease in decreased pain decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease or decrease the preprocessing ) OR ( decrease in decreased pain decrease ))*.