Perhaps you should try some spelling variations:
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"oecd economics department working papers" » "oecd economics development working papers", "oecd economics experiments working papers", "oecd economics management working papers", "oecd economics department boarding papers", "oecd economics department nursing papers", "oecd economics department work papers", "oecd economic department working papers", "kcd economics department working papers", "world economics department working papers", "oecd economics department working paper"
"oecd economies department trading houses" » "oecd technologies department trading houses", "oecd economies development trading houses", "oecd economies measurement trading houses", "oecd economies department training houses", "oecd economies department boarding houses", "oecd economies department crowding houses", "oecd economic department trading houses", "les economies department trading houses", "oecd economies department gaming houses", "oecd economies department riding house"

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 department working papers") OR ("oecd economics departments working papers"))) OR ("oecd economies department trading houses")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd economics department working papers\") OR (\"oecd economics departments working papers\"))) or (\"oecd economies department trading houses\"))".
• Removing quotes may allow a broader search: (((( oecd economics department working papers ) OR ( oecd economics departments working papers ))) or ( oecd economies department trading houses )).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economics department working papers") OR ("oecd economics departments working papers"))) or ("oecd economies department trading houses"))*.