Perhaps you should try some spelling variations:
the preprocessing » the processing (Expand search), their processing (Expand search), image preprocessing (Expand search)
decrease litter » increased litter (Expand search), decrease after (Expand search), decreases liver (Expand search)
litter decrease » faster decrease (Expand search), life decrease (Expand search)
rate decreases » rats decreases (Expand search), rate decrease (Expand search), water decreases (Expand search)
decrease rate » decreased rate (Expand search), decreases rate (Expand search), decrease at (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 rate decreases the preprocessing ) OR ( decrease litter decrease _ decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease rate decreases the preprocessing ) OR ( decrease litter decrease _ decrease ))*.