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 marked decrease" » "significantly larger decrease" (Expand Search), "significantly linked decrease" (Expand Search), "significantly improved decrease" (Expand Search), "significantly marked increase" (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 marked decrease\") OR (\"significantly improves decrease\"))~".
• Removing quotes may allow a broader search: (( significantly marked decrease ) OR ( significantly improves decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (("significantly marked decrease") OR ("significantly improves decrease"))*.