Perhaps you should try some spelling variations:
"oecd/africa climate change expert group papers" » "oecd/africa climate changing expert group papers", "oecd/africa climate channel experts group papers", "oecd/africa climate change effect group papers", "oecd/africa climate change expert group part", "oecd/afira climate change expert group papers", "oecd/afamerica climate change expert group papers", "oecd/afafrican climate change expert group papers"
"oecd/iea climate change expert group papers" » "oecd/iea climate changing expert group papers", "oecd/iea climate channel experts group papers", "oecd/iea climate change effect group papers", "oecd/iea climate change expert group part", "oecd/ira climate change expert group papers", "oecd/area climate change expert group papers", "oecd/a climate change expert group papers"
"oecd/sea climate change expert group papers" » "oecd/sea climate changing expert group papers", "oecd/sea climate channel experts group papers", "oecd/sea climate change effect group papers", "oecd/sea climate change expert group part", "oecd/asia climate change expert group papers", "oecd/a climate change expert group papers", "oecd/data climate change expert group papers"
"oecd/rica climate change extent group papers" » "oecd/rica climate change event group papers", "oecd/rica climate change latent group papers", "oecd/rica climate change extended group papers", "oecd/rica climate change extent group part", "oecd/ira climate change extent group papers", "oecd/america climate change extent group papers", "oecd/african climate change extent group papers", "oecd/rica climate change patent group papers"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oecd/africa climate change expert group papers") OR ((("oecd/iea climate change expert group papers") OR ("oecd/sea climate change expert group papers"))))) OR ("oecd/rica climate change extent group papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd/africa climate change expert group papers\") or (((\"oecd/iea climate change expert group papers\") OR (\"oecd/sea climate change expert group papers\"))))) or (\"oecd/rica climate change extent group papers\"))".
• Removing quotes may allow a broader search: (((( oecd/africa climate change expert group papers ) or ((( oecd/iea climate change expert group papers ) OR ( oecd/sea climate change expert group papers ))))) or ( oecd/rica climate change extent group papers )).
• Adding a wildcard symbol may retrieve word variants: (((("oecd/africa climate change expert group papers") or ((("oecd/iea climate change expert group papers") OR ("oecd/sea climate change expert group papers"))))) or ("oecd/rica climate change extent group papers"))*.