Perhaps you should try some spelling variations:
"child development century working papers" » "child development centre working papers", "child development centers working papers", "child development centered working papers", "child development century looking papers", "child development entry working papers"
"child development center working papers" » "child development centre working papers", "child development chapter working papers", "child development context working papers", "child development centred working papers", "child development inter working papers", "child development better working papers"
"child development center working paper" » "child development centre working paper", "child development chapter working paper", "child development context working paper", "child development centred working paper", "child development inter working paper", "child development better working paper"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("child development center working papers") OR ("child development center working paper"))) OR ("child development century working papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"child development center working papers\") OR (\"child development center working paper\"))) or (\"child development century working papers\"))".
• Removing quotes may allow a broader search: (((( child development center working papers ) OR ( child development center working paper ))) or ( child development century working papers )).
• Adding a wildcard symbol may retrieve word variants: (((("child development center working papers") OR ("child development center working paper"))) or ("child development century working papers"))*.