Perhaps you should try some spelling variations:
significantly improved » significantly increased (Expand Search)
significant increases » significant increase (Expand Search), significantly increased (Expand Search), significant decrease (Expand Search)
increases decrease » increased release (Expand Search)
improved decrease » improved urease (Expand Search), marked decrease (Expand Search)

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

• Removing quotes may allow a broader search: (( significant increases decrease ) OR ( significantly improved decrease )).