Perhaps you should try some spelling variations:
decrease yiel » decreases yield (Expand search), decrease il (Expand search), increase yield (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)
decrease not » decrease of (Expand search), decrease akt (Expand search), decrease at (Expand search)
not decrease » to decrease (Expand search), not increase (Expand search), and decrease (Expand search)
yiel pattern » yield pattern (Expand search), diel pattern (Expand search), diel patterns (Expand search)
decrease on » decrease in (Expand search), decrease of (Expand search), decrease or (Expand search)
on decrease » on decreased (Expand search), or decrease (Expand search), of decrease (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 the decrease on decrease ) OR ( decrease NOT decrease yiel pattern ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease the decrease on decrease ) OR ( decrease not decrease yiel pattern ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease the decrease on decrease ) OR ( decrease not decrease yiel pattern ))*.