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