Perhaps you should try some spelling variations:
decrease their » decrease the (Expand search), increase their (Expand search), decreases the (Expand search)
their objects » the objects (Expand search), their objectives (Expand search), their projects (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)
decrease hiv » decrease in (Expand search), decreased high (Expand search), decrease with (Expand search)
hiv decrease » via decrease (Expand search), hiv increase (Expand search), will decrease (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (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 AND decrease hiv decrease ) OR ( decrease to decrease their objects ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease and decrease hiv decrease ) OR ( decrease to decrease their objects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease and decrease hiv decrease ) OR ( decrease to decrease their objects ))*.