Perhaps you should try some spelling variations:
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"oecd economic department providing papers" » "oecd economic department crowding papers", "oecd economic department preparing papers", "oecd economic department training papers", "oecd economics department providing papers", "oecd economic debasement providing papers", "oecd academic department providing papers", "oecd economic department profiling papers", "oecd economic department providing layers", "oecd economic department proceeding papers"
"oecd economic department working papers" » "oecd economics department working papers", "oecd economic debasement working papers", "oecd academic department working papers", "oecd economic departments working papers", "oecd economic department nursing papers", "oecd economic department work papers", "oecd economic department working paper"
"oecd economic department boarding papers" » "oecd economics department boarding papers", "oecd economic debasement boarding papers", "oecd academic department boarding papers", "oecd economic department building papers", "oecd economic department boards papers", "oecd economic department recording papers", "oecd economic department boarding pass", "oecd economic department boarding passes", "oecd economic department learning 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 economic department working papers") OR ("oecd economics experiments working papers"))) OR ((("oecd economic department boarding papers") OR ("oecd economic department providing papers")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd economic department working papers\") or (\"oecd economics experiments working papers\"))) or (((\"oecd economic department boarding papers\") OR (\"oecd economic department providing papers\"))))".
• Removing quotes may allow a broader search: (((( oecd economic department working papers ) or ( oecd economics experiments working papers ))) or ((( oecd economic department boarding papers ) OR ( oecd economic department providing papers )))).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economic department working papers") or ("oecd economics experiments working papers"))) or ((("oecd economic department boarding papers") OR ("oecd economic department providing papers"))))*.