Perhaps you should try some spelling variations:
decrease hiv » decrease their (Expand search), decreased high (Expand search), decrease with (Expand search)
hiv increase » diet increase (Expand search), acid increase (Expand search), and increase (Expand search)
increase toc » increase to (Expand search), increase the (Expand search), increase tax (Expand search)
toc decrease » the decrease (Expand search), not decrease (Expand search), of decrease (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)
in effector » and effector (Expand search), of effector (Expand search), in effective (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 hiv increase toc decrease ) OR ( decrease to decrease in effector ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease hiv increase toc decrease ) OR ( decrease to decrease in effector ))*.