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