Perhaps you should try some spelling variations:
"child development concepts working papers" » "child development context working papers", "child development congresses working papers", "child development concepts learning papers", "child development concepts getting papers", "child development concepts within papers"
"oecd development control working paper" » "oecd development context working paper", "oecd development concept working paper", "based development control working paper", "oriented development control working paper", "oecd development content working paper"
"child development control working papers" » "child development context working papers", "child development concept working papers", "child development content working papers"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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