Perhaps you should try some spelling variations:
"oecd/rica climate change expert group part" » "oecd/rica climate change extent group part", "oecd/rica climate changing expert group part", "oecd/rica climate channel experts group part", "oecd/iea climate change expert group part", "oecd/america climate change expert group part", "oecd/african climate change expert group part", "oecd/rica climate change expert groups part"
"oecd/ira climate change expert group part" » "oecd/ira climate change extent group part", "oecd/ira climate changing expert group part", "oecd/ira climate channel experts group part", "oecd/era climate change expert group part", "oecd/iea climate change expert group part", "oecd/area climate change expert group part", "oecd/ira climate change expert groups part"
"oecd/africa climate change expert group papers" » "oecd/africa climate change extent group papers", "oecd/africa climate changing expert group papers", "oecd/africa climate channel experts group papers", "oecd/afiea climate change expert group papers", "oecd/afamerica climate change expert group papers", "oecd/afafrican climate change expert group papers"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd/rica climate change expert group part\") OR (\"oecd/ira climate change expert group part\"))) OR (\"oecd/africa climate change expert group papers\"))".
• Removing quotes may allow a broader search: (((( oecd/rica climate change expert group part ) OR ( oecd/ira climate change expert group part ))) OR ( oecd/africa climate change expert group papers )).
• Adding a wildcard symbol may retrieve word variants: (((("oecd/rica climate change expert group part") OR ("oecd/ira climate change expert group part"))) OR ("oecd/africa climate change expert group papers"))*.