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 better decrease" » "significantly greater decrease" (Expand Search), "significantly higher decrease" (Expand Search), "significantly lower decrease" (Expand Search), "significantly teer decrease" (Expand Search), "significantly between decreased" (Expand Search)

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