Perhaps you should try some spelling variations:
channel experts » channel export, channel effects, channel events
change expert » changing expert, change effect, change effort
change extent » change event, change latent, change extended
iea climate » sea climate, ira climate, area climate
group part » groups part

You may be able to get more results by adjusting your search query.

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