Perhaps you should try some spelling variations:
noise preprocessing » image preprocessing (Expand search), the preprocessing (Expand search), based preprocessing (Expand search)
decrease noise » decrease risk (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 may » decrease at (Expand search), decrease by (Expand search), decrease human (Expand search)
may increase » an increase (Expand search), can increase (Expand search), and increase (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 noise preprocessing ) OR ( decrease akt decrease may increase ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease or decrease noise preprocessing ) OR ( decrease akt decrease may increase ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease or decrease noise preprocessing ) OR ( decrease akt decrease may increase ))*.