Perhaps you should try some spelling variations:
enhancing effect » enhancing effects, enhancement effect, enhancing efficacy
changing expert » changing export, changing expertise, enhancing expert
channel experts » channel export, channel effects, channel events
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 ((((changing expert) OR (enhancing effect))) OR (channel experts)) group papers.
• Adding a wildcard symbol may retrieve word variants: oecd/iea climate ((((changing expert) or (enhancing effect))) or (channel experts)) group papers*.