Perhaps you should try some spelling variations:
blood preprocessing » blood processing (Expand search), based preprocessing (Expand search), and preprocessing (Expand search)
decrease faster » decrease after (Expand search), decrease further (Expand search), decreased after (Expand search)
faster decrease » rate decrease (Expand search)
decrease blood » decreases blood (Expand search), decreased blood (Expand search), increase blood (Expand search)
decrease at » decrease akt (Expand search), decrease and (Expand search), decrease in (Expand search)
at decrease » rate decrease (Expand search), that decrease (Expand search), and 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 at decrease blood preprocessing ) OR ( decrease faster decrease AND decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease at decrease blood preprocessing ) OR ( decrease faster decrease AND decrease ))*.