Perhaps you should try some spelling variations:
decrease response » decreased response (Expand search), increased response (Expand search), increases response (Expand search)
response defense » response decrease (Expand search), resource defense (Expand search)
decrease hiv » decrease in (Expand search), decrease their (Expand search), decreased high (Expand search)
hiv decrease » via decrease (Expand search), hiv increase (Expand search), will decrease (Expand search)
defense cots » defense costs (Expand search), defense cows (Expand search), defense courts (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)
cots based » dots based (Expand search), cots baseado (Expand search), hosts based (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 to decrease hiv decrease ) OR ( decrease response defense cots based ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease to decrease hiv decrease ) OR ( decrease response defense cots based ))*.