Perhaps you should try some spelling variations:
"oecd development content working papers" » "oecd development contents working papers", "oecd development contexts working papers", "oecd development concept working papers", "child development content working papers", "oriented development content working papers", "oecd development content working paper"
"based development content working papers" » "based development contents working papers", "based development contexts working papers", "based development concept working papers", "based development content working paper"
"oecd development context working papers" » "child development context working papers", "oriented development context working papers", "oecd development context looking papers", "oecd development text working papers", "oecd development control working papers", "oecd development context working paper"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("oecd development context working papers") OR ((("oecd development content working papers") OR ("based development content working papers")))).
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