Perhaps you should try some spelling variations:
decrease burden » disease burden (Expand search), decrease further (Expand search)
burden disease » bursal disease (Expand search)
decrease any » decrease and (Expand search), decreases and (Expand search), decreased and (Expand search)
any decrease » and decrease (Expand search), can decrease (Expand search), may decrease (Expand search)
disease and » diseases and (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 _ decrease any decrease ) OR ( decrease burden disease AND object ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease _ decrease any decrease ) OR ( decrease burden disease and object ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease _ decrease any decrease ) OR ( decrease burden disease and object ))*.