Perhaps you should try some spelling variations:
"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)
"significantly less decrease" » "significantly lower decrease" (Expand Search), "significantly reduce decrease" (Expand Search), "significantly better decrease" (Expand Search), "significantly mean decrease" (Expand Search), "significantly teer decrease" (Expand Search), "significantly we decrease" (Expand Search)

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