Perhaps you should try some spelling variations:
channel support » change support, channel supply, changing support
channel export » channel experts, channel port, channel errors
rica climate » africa climate, iea climate, ira climate
group papers » group part

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) OR (channel support)) group papers".
• Adding a wildcard symbol may retrieve word variants: oecd/rica climate ((channel export) OR (channel support)) group papers*.