Perhaps you should try some spelling variations:
decrease faster » decrease after (Expand search), decrease further (Expand search), decreased after (Expand search)
faster decrease » rate decrease (Expand search)
decrease hard » decrease and (Expand search), decrease hiv (Expand search), decrease akt (Expand search)
hard problem » and problem (Expand search), old problem (Expand search)
decrease toc » decrease of (Expand search), decrease the (Expand search), decreased to (Expand search)
toc decrease » to decrease (Expand search), the decrease (Expand search), not 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 faster decrease hard problem ) OR ( decrease NOT decrease toc decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease faster decrease hard problem ) OR ( decrease NOT decrease toc decrease ))*.