Perhaps you should try some spelling variations:
"oecd development cct working papers" » "based development cct working papers", "oriented development cct working papers", "oecd development cct working paper", "oecd development act working papers", "oecd development cost working papers", "oecd development net working papers"
"oecd development case working papers" » "based development case working papers", "oriented development case working papers", "oecd development chapter working papers", "oecd development case working paper", "oecd development care working papers", "oecd development base working papers", "oecd development clause working papers"
"child development cct working papers" » "child development cct working paper", "child development act working papers", "child development cost working papers", "child development net working papers"

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 cct working papers") OR ("child development cct working papers"))) OR ("oecd development case working papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd development cct working papers\") OR (\"child development cct working papers\"))) or (\"oecd development case working papers\"))".
• Removing quotes may allow a broader search: (((( oecd development cct working papers ) OR ( child development cct working papers ))) or ( oecd development case working papers )).
• Adding a wildcard symbol may retrieve word variants: (((("oecd development cct working papers") OR ("child development cct working papers"))) or ("oecd development case working papers"))*.