Perhaps you should try some spelling variations:
increase burden » decrease burden (Expand search), increasing burden (Expand search), increased burned (Expand search)
decrease rate » decreased rate (Expand search), decreases rate (Expand search), decrease at (Expand search)
rate increase » the increase (Expand search), and increase (Expand search), an increase (Expand search)
burden object » buried object (Expand search), urban object (Expand search), broken object (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.

• Removing quotes may allow a broader search: (( decrease AND decrease il decrease ) OR ( decrease rate increase burden object ))~.