Perhaps you should try some spelling variations:
decrease boundary » discrete boundary (Expand search), decrease urinary (Expand search)
decrease lesions » disease lesions (Expand search), decreased response (Expand search), decrease adhesion (Expand search)
lesions decrease » response decrease (Expand search), lesions case (Expand search)
boundary object » boundary objects (Expand search), boundary effects (Expand search)
decrease blood » decreases blood (Expand search), decreased blood (Expand search), increase blood (Expand search)
blood decrease » blood degree (Expand search), blood disease (Expand search), loss decrease (Expand search)
in decrease » in decreased (Expand search), on decrease (Expand search), pain 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 in decrease lesions decrease ) OR ( decrease blood decrease boundary object ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease in decrease lesions decrease ) OR ( decrease blood decrease boundary object ))*.