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