Perhaps you should try some spelling variations:
during decrease » during increased (Expand search), during depressed (Expand search), during disease (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 pro » decrease or (Expand search), decrease food (Expand search), decrease treg (Expand search)
pro decrease » or decrease (Expand search), price decrease (Expand search), term decrease (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (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: "(( increase during decrease hard problem ) OR ( decrease to decrease pro decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( increase during decrease hard problem ) OR ( decrease to decrease pro decrease ))*.