Perhaps you should try some spelling variations:
"oecd academic department buying papers" » "oecd academic departments buying papers", "oecd academic patent buying papers", "oecd academic development buying papers", "oecd academic department being papers", "oecd academic department building papers", "oecd academic department nursing papers", "lead academic department buying papers", "second academic department buying papers", "world academic department buying papers", "oecd academic department buying apps", "oecd academic department buying cars", "oecd academic department buying aes"
"oecd academic department buying power" » "oecd academic departments buying power", "oecd academic patent buying power", "oecd academic development buying power", "oecd academic department being power", "oecd academic department building power", "oecd academic department nursing power", "lead academic department buying power", "second academic department buying power", "world academic department buying power"
"oecd economic department working paper" » "oecd economics department working paper", "oecd economic debasement working paper", "oecd economic experiment working paper", "oecd economic departments working paper", "oecd economic department boarding paper", "oecd economic department nursing paper"

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 academic department buying papers") OR ("oecd academic department buying power"))) OR ("oecd economic department working paper")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd academic department buying papers\") OR (\"oecd academic department buying power\"))) or (\"oecd economic department working paper\"))".
• Removing quotes may allow a broader search: (((( oecd academic department buying papers ) OR ( oecd academic department buying power ))) or ( oecd economic department working paper )).
• Adding a wildcard symbol may retrieve word variants: (((("oecd academic department buying papers") OR ("oecd academic department buying power"))) or ("oecd economic department working paper"))*.