Perhaps you should try some spelling variations:
decrease burden » disease burden (Expand search), decrease further (Expand search)
burden disease » bursal disease (Expand search)
disease actor » disease factors (Expand search), disease vector (Expand search), disease sector (Expand search)
decrease can » decrease in (Expand search), decrease and (Expand search), decrease on (Expand search)
can decrease » can increase (Expand search), and decrease (Expand search), to decrease (Expand search)
actor object » action object (Expand search), alter object (Expand search), actor subjects (Expand search)
decrease at » decrease akt (Expand search), decrease and (Expand search), decrease in (Expand search)
at decrease » rate decrease (Expand search), that decrease (Expand search), and 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 at decrease can decrease ) OR ( decrease burden disease actor object ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease at decrease can decrease ) OR ( decrease burden disease actor object ))*.