Perhaps you should try some spelling variations:
operational procedures » operational procedure (Expand search), operating procedures (Expand search), operational processes (Expand search)
decrease operational » increase operational (Expand search), disease operational (Expand search), decrease cooperation (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)
decreases and » decreases in (Expand search), decreases _ (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease lesions decrease operational procedures ) OR ( decrease OR decreases AND decrease ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease lesions decrease operational procedures ) OR ( decrease OR decreases and decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease lesions decrease operational procedures ) OR ( decrease OR decreases and decrease ))*.