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 small decrease" » "significantly smaller decrease" (Expand Search), "significantly impact decrease" (Expand Search), "significantly impair decrease" (Expand Search), "significantly small increased" (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 improves decrease\") OR (\"significantly small decrease\"))~".
• Removing quotes may allow a broader search: (( significantly improves decrease ) OR ( significantly small decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (("significantly improves decrease") OR ("significantly small decrease"))*.