Perhaps you should try some spelling variations:
image preprocessing » image processing (Expand search), images processing (Expand search), data preprocessing (Expand search)
decrease further » increase further (Expand search), disease further (Expand search), decrease the (Expand search)
further decrease » further increase (Expand search), faster decrease (Expand search), the decrease (Expand search)
decrease image » decrease age (Expand search), decrease intimate (Expand search), decreases immune (Expand search)
decrease with » decreases with (Expand search), increase with (Expand search), decrease in (Expand search)
with decrease » with decreased (Expand search), with deceased (Expand search), with increase (Expand search)
decrease not » decrease of (Expand search), decrease akt (Expand search), decrease at (Expand search)
not decrease » to decrease (Expand search), not increase (Expand search), and 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 NOT decrease image preprocessing ) OR ( decrease further decrease with decrease ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease not decrease image preprocessing ) OR ( decrease further decrease with decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease not decrease image preprocessing ) OR ( decrease further decrease with decrease ))*.