Perhaps you should try some spelling variations:
"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)
"significant level decrease" » "significance level decrease" (Expand Search), "significance levels decrease" (Expand Search), "significant gender decrease" (Expand Search), "significant levels decreased" (Expand Search), "significant level increased" (Expand Search), "significant teer decrease" (Expand Search)

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