Perhaps you should try some spelling variations:
"significantly impaired decrease" » "significantly impairs decrease" (Expand Search), "significantly improved decrease" (Expand Search), "significantly improve decrease" (Expand Search), "significantly impairsed decrease" (Expand Search), "significantly impacted decrease" (Expand Search), "significantly impactsed decrease" (Expand Search), "significantly marked decrease" (Expand Search)
"significantly impair decrease" » "significantly impairs decrease" (Expand Search), "significantly impact decrease" (Expand Search), "significantly impacts decrease" (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 impair decrease\") OR (\"significantly impaired decrease\"))~".
• Removing quotes may allow a broader search: (( significantly impair decrease ) OR ( significantly impaired decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (("significantly impair decrease") OR ("significantly impaired decrease"))*.