Perhaps you should try some spelling variations:
in preprocessing » in reprocessing (Expand search), and preprocessing (Expand search), via preprocessing (Expand search)
decrease ratio » decreased ratio (Expand search), decrease at (Expand search), decreased rate (Expand search)
ratio decrease » rate decrease (Expand search), rapid decrease (Expand search), ratio increase (Expand search)
decrease human » increase human (Expand search), disease human (Expand search), decrease asian (Expand search)
disease to » disease the (Expand search), disease _ (Expand search), disease type (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 ratio decrease in preprocessing ) OR ( decrease human disease to decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease ratio decrease in preprocessing ) OR ( decrease human disease to decrease ))*.