Perhaps you should try some spelling variations:
decrease nonlinear » discrete nonlinear (Expand search), degenerate nonlinear (Expand search)
nonlinear problem » nonlinear problems (Expand search)
decrease faster » decrease after (Expand search), decrease further (Expand search), decreased after (Expand search)
faster decrease » rate decrease (Expand search)
in decrease » in decreased (Expand search), and decrease (Expand search), can decrease (Expand search)
decrease il » decreased il (Expand search), decrease hiv (Expand search), decrease of (Expand search)
il decrease » l decrease (Expand search), will decrease (Expand search), oil decreases (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 in decrease nonlinear problem ) OR ( decrease faster decrease il decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease in decrease nonlinear problem ) OR ( decrease faster decrease il decrease ))*.