Perhaps you should try some spelling variations:
significantly improves » significantly improved (Expand Search), significantly improve (Expand Search), significant improvements (Expand Search)
significantly linked » significantly longer (Expand Search), significantly altered (Expand Search), significantly changed (Expand Search)
improves decrease » improves disease (Expand Search), improve disease (Expand Search), improved urease (Expand Search)
linked decrease » marked decrease (Expand Search), linear decrease (Expand Search)

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

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