Perhaps you should try some spelling variations:
climate channel » climate change, climate changes, climate changed
expert groups » expert group
rica climate » africa climate, iea climate, ira climate
export group » expert group, port group, report group

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "oecd/rica climate channel ((export group) OR (expert groups)) papers".
• Adding a wildcard symbol may retrieve word variants: oecd/rica climate channel ((export group) OR (expert groups)) papers*.