Perhaps you should try some spelling variations:
decrease burden » disease burden (Expand search), decrease further (Expand search)
burden decrease » burden disease (Expand search), urea decrease (Expand search), burgers decreases (Expand search)
decreased ant » decreased and (Expand search), decreased akt (Expand search), decreased akt1 (Expand search)
ant decrease » and decrease (Expand search), any decrease (Expand search), not decrease (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
and object » an object (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 _ decreased ant decrease ) OR ( decrease burden decrease AND object ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease _ decreased ant decrease ) OR ( decrease burden decrease and object ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease _ decreased ant decrease ) OR ( decrease burden decrease and object ))*.