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