Perhaps you should try some spelling variations:
decrease during » increase during (Expand search), increases during (Expand search), increased during (Expand search)
that decrease » that increase (Expand search), that increases (Expand search), not decrease (Expand search)
during effect » enduring effect (Expand search), curling effect (Expand search), pouring effect (Expand search)
decrees that » devices that (Expand search), trees that (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)
decrease on » decrease in (Expand search), decrease of (Expand search), decrease or (Expand search)
on decrees » on decree (Expand search), on degrees (Expand search), and decrees (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 on decrees that decrease ) OR ( decrease hiv decrease during effect ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease on decrees that decrease ) OR ( decrease hiv decrease during effect ))*.