Perhaps you should try some spelling variations:
at preprocessing » data preprocessing (Expand search), and preprocessing (Expand search), by preprocessing (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)
and decreased » and decreases (Expand search), and increased (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
decrease at » decrease akt (Expand search), decrease in (Expand search), decrease of (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 _ decrease at preprocessing ) OR ( decrease with decrease AND decreased ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease _ decrease at preprocessing ) OR ( decrease with decrease and decreased ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease _ decrease at preprocessing ) OR ( decrease with decrease and decreased ))*.