Perhaps you should try some spelling variations:
channel experts » channel export, channel effects, channel events
change expert » change extent, changing expert, change effect
rica climate » africa climate, iea climate, ira climate
area climate » asia climate, sea climate, africa climate
group papers » group 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/((rica climate) OR (area climate)) ((change expert) OR (channel experts)) group papers.
• Adding a wildcard symbol may retrieve word variants: oecd/((rica climate) or (area climate)) ((change expert) or (channel experts)) group papers*.