Perhaps you should try some spelling variations:
"imf's policy discussion papers" » "imf's policy discussion paper", "imf's policy discussion part", "imf's policy discussion panel"
"imf's policy decision papers" » "imf's policy decisions papers", "imf's policy decision makers", "imf's policy decision panels", "imf's policy decision takers"
"imf's policy design papers" » "imf's policy designs papers", "imf's policy design paper", "imf's policy design patters"

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