Perhaps you should try some spelling variations:
the preprocessing » the processing (Expand search), their processing (Expand search), image preprocessing (Expand search)
decrease during » increase during (Expand search), increases during (Expand search), increased during (Expand search)
during decrease » during increased (Expand search), during depressed (Expand search), taping decrease (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (Expand search)
on decreased » in decreased (Expand search), of decreased (Expand search), on deceased (Expand search)
decreased in » decrease in (Expand search)
decrease on » decrease in (Expand search), decrease of (Expand search), decrease or (Expand search)
in decrease » in decreased (Expand search), on decrease (Expand search), pain decrease (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 during decrease the preprocessing ) OR ( decrease on decreased in decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease during decrease the preprocessing ) OR ( decrease on decreased in decrease ))*.