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