Perhaps you should try some spelling variations:
spread patterns » spread pattern (Expand search)
decrease spread » disease spread (Expand search), decreases spreading (Expand search), decreased steady (Expand search)
decrease hiv » decrease their (Expand search), decreased high (Expand search), decrease with (Expand search)
hiv decrease » via decrease (Expand search), hiv increase (Expand search), will decrease (Expand search)
in decreased » is decreased (Expand search), in deceased (Expand search), and decreased (Expand search)
decrease the » decreases the (Expand search), decrease of (Expand search)
the decrease » to decrease (Expand search), and 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 hiv decrease in decreased ) OR ( decrease the decrease spread patterns ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease hiv decrease in decreased ) OR ( decrease the decrease spread patterns ))*.