Perhaps you should try some spelling variations:
"based development cost working papers" » "based development co working papers", "based development context working papers", "based development concept working papers", "based development cost working paper", "based development list working papers", "based development font working papers", "based development ist working papers"
"oecd development hot working papers" » "oriented development hot working papers", "oecd development host working papers", "oecd development how working papers", "oecd development http working papers", "oecd development hot working paper", "oecd development net working papers", "oecd development set working papers", "oecd development joint working papers"
"child development hot working papers" » "child development host working papers", "child development how working papers", "child development http working papers", "child development hot working paper", "child development net working papers", "child development set working papers", "child development joint working papers"

Try widening your search to All Fields.

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