Perhaps you should try some spelling variations:
significantly improves » significantly improved (Expand Search), significantly improve (Expand Search), significant improvements (Expand Search)
significantly affected » significantly associated (Expand Search), significantly reduced (Expand Search), significant effect (Expand Search)
improves decrease » improves disease (Expand Search), improve disease (Expand Search), improved urease (Expand Search)
affected decrease » affected areas (Expand Search), effects decreased (Expand Search)

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

• Removing quotes may allow a broader search: (( significantly improves decrease ) OR ( significantly affected decrease )).