Perhaps you should try some spelling variations:
decrease burden » disease burden (Expand search), decrease further (Expand search)
burden disease » bursal disease (Expand search)
decrease akt » decrease and (Expand search), decrease after (Expand search), decrease with (Expand search)
akt decrease » and decrease (Expand search), not decrease (Expand search), any decrease (Expand search)
decrease at » decrease and (Expand search), decrease in (Expand search), decrease of (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 akt decrease ) OR ( decrease burden disease AND object ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease at decrease akt decrease ) OR ( decrease burden disease AND object ))*.