Perhaps you should try some spelling variations:
decrease spatial » decrease survival (Expand search), decrease striatal (Expand search), decrease asian (Expand search)
spatial effect » spatial effects (Expand search), spatial neglect (Expand search), spatial extent (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 il » decreased il (Expand search), decrease in (Expand search), decrease _ (Expand search)
il decrease » l decrease (Expand search), will decrease (Expand search), oil decreases (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 il decrease hiv decrease ) OR ( decrease of decrease spatial effect ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease il decrease hiv decrease ) OR ( decrease of decrease spatial effect ))*.