Perhaps you should try some spelling variations:
optimum processing » optimum pressing (Expand search), minimum processing (Expand search), optical processing (Expand search)
decrease optimum » discrete optimum (Expand search), decrease sodium (Expand search), reverse optimum (Expand search)
during depressed » during depressive (Expand search), during repressive (Expand search), feeling depressed (Expand search)
decrease during » increase during (Expand search), increases during (Expand search), increased during (Expand search)
decrease can » decrease in (Expand search), decrease and (Expand search), decrease at (Expand search)
can decrease » can increase (Expand search), and decrease (Expand search), to decrease (Expand search)
or decrease » of decrease (Expand search), not decrease (Expand search), to decrease (Expand search)
decrease or » decrease of (Expand search), decrease on (Expand search), decrease pro (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 can decrease optimum processing ) OR ( decrease OR decrease during depressed ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease can decrease optimum processing ) OR ( decrease or decrease during depressed ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease can decrease optimum processing ) OR ( decrease or decrease during depressed ))*.