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 marked decrease" (Expand Search)
"significantly smaller decrease" » "significantly higher decrease" (Expand Search), "significantly lower decrease" (Expand Search), "significantly greater decrease" (Expand Search), "significantly small decrease" (Expand Search), "significantly marked decrease" (Expand Search), "significantly smaller areas" (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("significantly smaller decrease") OR ("significantly impaired decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"significantly smaller decrease\") OR (\"significantly impaired decrease\"))".
• Removing quotes may allow a broader search: (( significantly smaller decrease ) OR ( significantly impaired decrease )).
• Adding a wildcard symbol may retrieve word variants: (("significantly smaller decrease") OR ("significantly impaired decrease"))*.