Perhaps you should try some spelling variations:
optical processing » spatial processing (Expand search), lexical processing (Expand search), chemical processing (Expand search)
decrease walking » increase walking (Expand search), decrease during (Expand search), decrease lodging (Expand search)
walking decrease » walking decreases (Expand search), warming decreases (Expand search), taping decrease (Expand search)
decrease optical » decrease physical (Expand search), decrease fetal (Expand search), decrease total (Expand search)
decrease lesions » disease lesions (Expand search), decreased response (Expand search), decrease adhesion (Expand search)
lesions case » lesion case (Expand search), lesions caused (Expand search), lesions based (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 walking decrease optical processing ) OR ( decrease lesions case OR decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease walking decrease optical processing ) OR ( decrease lesions case OR decrease ))*.