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 weaker decrease" » "significantly greater decrease" (Expand Search), "significantly better decrease" (Expand Search), "significantly related decrease" (Expand Search), "significantly teer decrease" (Expand Search), "significantly water decreases" (Expand Search)

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