Perhaps you should try some spelling variations:
"oecd economies developments working papers" » "oecd economics developments working papers", "oecd economies development working papers", "oecd economic developments working papers", "oecd economies development looking papers", "oecd economies developments during papers"
"oecd economies developments working paper" » "oecd economics developments working paper", "oecd economies development working paper", "oecd economic developments working paper", "oecd economies development looking paper", "oecd economies developments during paper"
"oecd economies developments sorting papers" » "oecd economics developments sorting papers", "oecd economies development sorting papers", "oecd economic developments sorting papers", "oecd economies development porting papers", "oecd economies developments sorption papers", "oecd economies development starting papers", "oecd economies developments morning papers", "oecd economies developments sorting layers", "oecd economies developments sorting patterns"
"oecd economics payments working papers" » "oecd economics comments working papers", "oecd economy payments working papers", "oecd economics students working papers", "oecd economics patients working papers", "oecd economics elements working papers", "oecd economics agents working papers", "oecd economic payments working papers", "kcd economics payments working papers", "world economics payments working papers"

Try widening your search to All Fields.

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