Perhaps you should try some spelling variations:
decrease reservoir » disease reservoirs (Expand search), dense reservoir (Expand search), diverse reservoir (Expand search)
reservoir effect » reservoir effects (Expand search), reserve effect (Expand search)
decrease burden » disease burden (Expand search), decrease further (Expand search)
burden decrease » burden disease (Expand search), urea decrease (Expand search), burgers decreases (Expand search)
decrease rate » decreased rate (Expand search), decreases rate (Expand search), decrease at (Expand search)
rate decrease » rats decreases (Expand search), rate increase (Expand search), to decrease (Expand search)
decrease of » decrease in (Expand search)
of decrease » or decrease (Expand search), not decrease (Expand search), to 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 burden decrease of decrease ) OR ( decrease rate decrease reservoir effect ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease burden decrease of decrease ) OR ( decrease rate decrease reservoir effect ))*.