Perhaps you should try some spelling variations:
significantly improve » significantly improved (Expand Search)
significantly varyer » significantly larger (Expand Search), significantly vary (Expand Search), significantly alter (Expand Search)
improve decrease » improve disease (Expand Search), improved urease (Expand Search), improves disease (Expand Search)
varyer decrease » larger decrease (Expand Search), marked decrease (Expand Search), largest decrease (Expand Search)

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

• Removing quotes may allow a broader search: (( significantly varyer decrease ) OR ( significantly improve decrease ))~.