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 weaker decrease" » "significantly greater decrease" (Expand Search), "significantly better decrease" (Expand Search), "significantly smaller 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 weaker decrease") OR ("significantly related decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"significantly weaker decrease\") OR (\"significantly related decrease\"))".
• Removing quotes may allow a broader search: (( significantly weaker decrease ) OR ( significantly related decrease )).
• Adding a wildcard symbol may retrieve word variants: (("significantly weaker decrease") OR ("significantly related decrease"))*.