Perhaps you should try some spelling variations:
"significantly predicted decrease" » "significantly reduced decrease" (Expand Search), "significantly reduce decrease" (Expand Search), "significant predictor decrease" (Expand Search), "significantly predicted secreted" (Expand Search), "significantly reported decrease" (Expand Search)
"significantly greatest decrease" » "significantly greater decrease" (Expand Search), "significantly related decrease" (Expand Search), "significantly increases decrease" (Expand Search), "significantly treatment decreased" (Expand Search), "significantly greater increase" (Expand Search)

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