Perhaps you should try some spelling variations:
channel experts » channel export, channel events, channel excess
channel effects » change effects
change expert » change extent, changing expert, change effort
change effect » change effects, changes effect, charge effects
group papers » group part
iea climate » sea climate, ira climate, area climate

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 effect))) OR (((channel experts) OR (channel effects)))) group papers.
• The words AND, OR and NOT may confuse the search; try adding quotes: "oecd/iea climate ((((change expert) OR (change effect))) or (((channel experts) or (channel effects)))) group papers".
• Adding a wildcard symbol may retrieve word variants: oecd/iea climate ((((change expert) OR (change effect))) or (((channel experts) or (channel effects)))) group papers*.