Perhaps you should try some spelling variations:
channel experts » channel export, channel effects, channel excess
channel events » change events, channel effects, channel currents
change expert » change extent, changing expert, change effect
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 (((channel experts) OR (channel events)))) ((group papers) OR (group part)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "oecd/iea climate ((change expert) or (((channel experts) or (channel events)))) ((group papers) OR (group part))".
• Adding a wildcard symbol may retrieve word variants: oecd/iea climate ((change expert) or (((channel experts) or (channel events)))) ((group papers) OR (group part))*.