Perhaps you should try some spelling variations:
"significantly improves decrease" » "significantly improved decrease" (Expand Search), "significantly improve decrease" (Expand Search), "significantly improving decrease" (Expand Search), "significantly improves disease" (Expand Search), "significantly improve disease" (Expand Search), "significantly improved urease" (Expand Search)
"significantly greater decrease" » "significantly correlated decrease" (Expand Search), "significantly increased decrease" (Expand Search), "significantly higher decrease" (Expand Search), "significantly greatest decrease" (Expand Search), "significantly greater increase" (Expand Search), "significantly greater disease" (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"significantly greater decrease\") OR (\"significantly improves decrease\"))~".
• Removing quotes may allow a broader search: (( significantly greater decrease ) OR ( significantly improves decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (("significantly greater decrease") OR ("significantly improves decrease"))*.