Perhaps you should try some spelling variations:
"significantly related decrease" » "significantly correlated decrease" (Expand Search), "significantly elevated decrease" (Expand Search), "significantly reduced decrease" (Expand Search), "significantly reported decrease" (Expand Search), "significantly related disease" (Expand Search), "significantly greater decrease" (Expand Search)
"significantly less decrease" » "significantly lower decrease" (Expand Search), "significantly reduce decrease" (Expand Search), "significantly better decrease" (Expand Search), "significantly mean decrease" (Expand Search), "significantly teer decrease" (Expand Search), "significantly we decrease" (Expand Search)

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