Perhaps you should try some spelling variations:
decrease optimum » discrete optimum (Expand search), decrease sodium (Expand search), reverse optimum (Expand search)
optimum training » optimum planting (Expand search), optimum spacing (Expand search)
decreased after » decrease after (Expand search), increased after (Expand search)
decrease owing » decrease lodging (Expand search), decrease during (Expand search), decrease in (Expand search)
owing decrease » taping decrease (Expand search), will decrease (Expand search), skins decrease (Expand search)
after decrease » faster decrease (Expand search), after deceased (Expand search), litter decrease (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (Expand search)
the decrease » to decrease (Expand search), and 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 owing decrease optimum training ) OR ( decreased after decrease the decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease owing decrease optimum training ) OR ( decreased after decrease the decrease ))*.