Perhaps you should try some spelling variations:
decrease association » disease association (Expand search), disease associations (Expand search), case association (Expand search)
association patterns » defoliation patterns (Expand search), colonization patterns (Expand search), activation patterns (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (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)
decrease il » decreased il (Expand search), decrease in (Expand search), decrease hiv (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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease AND decrease il decrease ) OR ( decrease toc decrease association patterns ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease and decrease il decrease ) OR ( decrease toc decrease association patterns ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease and decrease il decrease ) OR ( decrease toc decrease association patterns ))*.