Perhaps you should try some spelling variations:
discrete optimum » discrete optimal (Expand search), discrete maximum (Expand search), discrete time (Expand search)
optimum timing » optimal timing (Expand search), optimum training (Expand search), optimum damping (Expand search)
decrease can » decrease and (Expand search), decrease at (Expand search), decrease on (Expand search)
can discrete » chain discrete (Expand search), in discrete (Expand search), and discrete (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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease can discrete optimum timing ) OR ( decrease in decrease _ decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease can discrete optimum timing ) OR ( decrease in decrease _ decrease ))*.