Perhaps you should try some spelling variations:
"significantly reported decrease" » "significantly related decrease" (Expand Search), "significantly restored decrease" (Expand Search), "significantly predicted decrease" (Expand Search), "significantly reported disease" (Expand Search), "significantly reported depressive" (Expand Search), "significantly reported case" (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)

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