Perhaps you should try some spelling variations:
discrete optimum » discrete optimal (Expand search), discrete maximum (Expand search), discrete time (Expand search)
optimum training » optimum planting (Expand search), optimum spacing (Expand search)
decrease faster » decrease after (Expand search), decrease further (Expand search), decreased after (Expand search)
faster decrease » rate decrease (Expand search)
decrease owing » decrease lodging (Expand search), decrease during (Expand search), decrease in (Expand search)
owing discrete » using discrete (Expand search), paying discrete (Expand search), in discrete (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( decrease owing discrete optimum training ) OR ( decrease faster decrease to decrease ))~.