Perhaps you should try some spelling variations:
"oecd economics experiments working papers" » "oecd economic experiments working papers", "oecd proteomics experiments working papers", "oecd dynamics experiments working papers", "oecd economics experiments during papers", "oecd economics experiments tending papers", "oecd economics experiments leading papers", "oecd economics experiments working paper", "oecd economies experiments working papers", "kcd economics experiments working papers", "world economics experiments working papers"
"oecd economics experiments modeling papers" » "oecd economic experiments modeling papers", "oecd proteomics experiments modeling papers", "oecd dynamics experiments modeling papers", "oecd economics experimental modeling papers", "oecd economics experimental models papers", "oecd economics experimental model papers", "oecd economics experiments modelling papers", "oecd economics experiments modeling players", "oecd economics experiments modeling payer", "oecd economies experiments modeling papers", "kcd economics experiments modeling papers", "world economics experiments modeling papers"
"oecd economics experiments using papers" » "oecd economic experiments using papers", "oecd proteomics experiments using papers", "oecd dynamics experiments using papers", "oecd economies experiments using papers", "kcd economics experiments using papers", "world economics experiments using papers", "oecd economics experiments using paper", "oecd economics experiments using panels", "oecd economics experiments being 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 boarding papers", "oecd economic department nursing papers", "oecd economic department working 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 economic department working papers") OR ((((("oecd economics experiments working papers") OR ("oecd economics experiments modeling papers"))) OR ("oecd economics experiments using 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 economics experiments modeling papers\"))) or (\"oecd economics experiments using papers\"))))".
• Removing quotes may allow a broader search: (( oecd economic department working papers ) or ((((( oecd economics experiments working papers ) OR ( oecd economics experiments modeling papers ))) or ( oecd economics experiments using papers )))).
• Adding a wildcard symbol may retrieve word variants: (("oecd economic department working papers") or ((((("oecd economics experiments working papers") OR ("oecd economics experiments modeling papers"))) or ("oecd economics experiments using papers"))))*.