Perhaps you should try some spelling variations:
decrease optical » decrease physical (Expand search), decrease fetal (Expand search), decrease total (Expand search)
optical effects » clinical effects (Expand search)
decrease fear » decreased fear (Expand search), decrease fetal (Expand search), decreased heart (Expand search)
fear decrease » break decrease (Expand search), merr decreases (Expand search), can decrease (Expand search)
decrease at » decrease akt (Expand search), decrease and (Expand search), decrease in (Expand search)
at decrease » rate decrease (Expand search), that 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 AND decrease fear decrease ) OR ( decrease at decrease optical effects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease AND decrease fear decrease ) OR ( decrease at decrease optical effects ))*.