Perhaps you should try some spelling variations:
optimum processing » optimum pressing (Expand search), minimum processing (Expand search), optical processing (Expand search)
discrete optimum » discrete optimal (Expand search), discrete maximum (Expand search), discrete time (Expand search)
decrease can » decrease in (Expand search), decrease and (Expand search), decrease at (Expand search)
can discrete » chain discrete (Expand search), in discrete (Expand search), and discrete (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease can discrete optimum processing ) OR ( decrease _ decrease to decrease ))~".
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