Perhaps you should try some spelling variations:
optical properties » physical properties (Expand search)
decrease optical » decrease physical (Expand search), decrease fetal (Expand search), decrease total (Expand search)
decrease with » decreases with (Expand search), increase with (Expand search), decrease the (Expand search)
with deceased » with decreased (Expand search), with increased (Expand search), with disease (Expand search)
deceased not » deceased donor (Expand search), decreased akt (Expand search), decreased ant (Expand search)
not decrease » to decrease (Expand search), not increase (Expand search), and 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.

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