Perhaps you should try some spelling variations:
the preprocessing » the processing (Expand search), their processing (Expand search), image preprocessing (Expand search)
decreased brain » decreases brain (Expand search), increased brain (Expand search), decreased in (Expand search)
brain decrease » brain decreases (Expand search), brazil decrease (Expand search), strain decrease (Expand search)
decrease flow » decreases flow (Expand search), decrease low (Expand search), decrease food (Expand search)
flow decrease » flow increase (Expand search), to decrease (Expand search), not decrease (Expand search)
not decreased » not decrease (Expand search), to decreased (Expand search), not increased (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (Expand search)
decrease not » decrease of (Expand search), decrease akt (Expand search), decrease at (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 flow decrease the preprocessing ) OR ( decrease NOT decreased brain decrease ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease flow decrease the preprocessing ) OR ( decrease not decreased brain decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease flow decrease the preprocessing ) OR ( decrease not decreased brain decrease ))*.