Perhaps you should try some spelling variations:
the preprocessing » the processing (Expand search), their processing (Expand search), image preprocessing (Expand search)
after decreased » after deceased (Expand search), after deccased (Expand search), buffer decreased (Expand search)
decreased brain » decreases brain (Expand search), increased brain (Expand search), decreased in (Expand search)
decrease after » increase after (Expand search), disease after (Expand search)
brain decrease » brain decreases (Expand search), brazil decrease (Expand search), strain decrease (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (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 NOT decrease the preprocessing ) OR ( decrease after decreased brain decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease NOT decrease the preprocessing ) OR ( decrease after decreased brain decrease ))*.