Perhaps you should try some spelling variations:
"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"
"secondary academic paper boarding papers" » "secondary economic paper boarding papers", "secondary cosmic paper boarding papers", "secondary academic paper boarding pass", "secondary academic paper boarding passes", "secondary academic paper marking papers", "secondary academic papers boarding papers", "secondary academic power boarding papers", "secondary academic leaders boarding papers", "secondary academic paper folding papers", "secondary academic paper coating papers", "secondary academic paper coding papers"
"second academic paper boarding papers" » "beyond academic paper boarding papers", "beyond academia paper boarding papers", "becoming academic paper boarding papers", "second academic paper boarding pass", "second academic paper boarding passes", "second academic paper marking papers", "second academic papers boarding papers", "second academic power boarding papers", "second academic leaders boarding papers", "second academic paper folding papers", "second academic paper coating papers", "second academic paper coding 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: (((("second academic paper boarding papers") OR ("secondary academic paper boarding papers"))) OR ("oecd economic department working papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"second academic paper boarding papers\") OR (\"secondary academic paper boarding papers\"))) or (\"oecd economic department working papers\"))".
• Removing quotes may allow a broader search: (((( second academic paper boarding papers ) OR ( secondary academic paper boarding papers ))) or ( oecd economic department working papers )).
• Adding a wildcard symbol may retrieve word variants: (((("second academic paper boarding papers") OR ("secondary academic paper boarding papers"))) or ("oecd economic department working papers"))*.