Perhaps you should try some spelling variations:
"significantly prevented decrease" » "significantly predicted decrease" (Expand Search), "significantly elevated decrease" (Expand Search), "significantly related decrease" (Expand Search), "significantly prevented disease" (Expand Search), "significantly reported decrease" (Expand Search), "significantly prevalence decreased" (Expand Search)
"significantly altered decrease" » "significantly affected decrease" (Expand Search), "significantly elevated decrease" (Expand Search), "significantly lower decrease" (Expand Search), "significantly altered release" (Expand Search), "significantly observed decrease" (Expand Search), "significantly teer decrease" (Expand Search)

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