Perhaps you should try some spelling variations:
and preprocessing » and reprocessing (Expand search), based preprocessing (Expand search), data preprocessing (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
decrease α » decrease _ (Expand search), decrease β (Expand search), decrease in (Expand search)
α decrease » _ decrease (Expand search), to decrease (Expand search), or decrease (Expand search)
decrease on » decrease in (Expand search), decrease of (Expand search), decrease or (Expand search)
on decrease » on decreased (Expand search), or decrease (Expand search), of 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 α decrease AND preprocessing ) OR ( decrease on decrease NOT decrease ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease α decrease and preprocessing ) OR ( decrease on decrease NOT decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease α decrease and preprocessing ) OR ( decrease on decrease NOT decrease ))*.