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 high decrease" » "significantly higher decrease" (Expand Search), "significantly change decrease" (Expand Search), "significantly less decrease" (Expand Search), "significantly slight decrease" (Expand Search), "significantly high degree" (Expand Search), "significantly high disease" (Expand Search)

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