Perhaps you should try some spelling variations:
decrease yield » decreases yield (Expand search), increase yield (Expand search), increases yield (Expand search)
decrease mesh » decreased mean (Expand search), decrease men's (Expand search), decrease with (Expand search)
mesh decrease » times decrease (Expand search), may decrease (Expand search), term decrease (Expand search)
yield pattern » yield after (Expand search), yield water (Expand search), yield protein (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)

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 NOT decrease AND decrease ) OR ( decrease mesh decrease yield pattern ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease not decrease AND decrease ) OR ( decrease mesh decrease yield pattern ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease not decrease AND decrease ) OR ( decrease mesh decrease yield pattern ))*.