Perhaps you should try some spelling variations:
decrease yiel » decreases yield (Expand search), decrease il (Expand search), increase yield (Expand search)
decrease any » decrease and (Expand search), decreases and (Expand search), decreased and (Expand search)
any decrease » and decrease (Expand search), can decrease (Expand search), may decrease (Expand search)
yiel pattern » yield pattern (Expand search), diel pattern (Expand search), diel patterns (Expand search)
decrease of » decrease in (Expand search)
of decrease » or decrease (Expand search), not decrease (Expand search), to 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 AND decrease of decrease ) OR ( decrease any decrease yiel pattern ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease AND decrease of decrease ) OR ( decrease any decrease yiel pattern ))*.