Perhaps you should try some spelling variations:
channel experts » channel export, channel effects, channel events
climate channel » climate change, climate changes, climate changed
america climate » american climate
change expert » changing expert, change effect, change effort
change extent » change event, change latent, change extended
experts group » expert group, experts ground, expert groups
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) OR (change extent)) group papers ) OR ((( oecd/rica climate channel experts group papers ) OR ( oecd/america climate channel experts group papers )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( oecd/africa climate ((change expert) OR (change extent)) group papers ) or ((( oecd/rica climate channel experts group papers ) or ( oecd/america climate channel experts group papers ))))".
• Adding a wildcard symbol may retrieve word variants: (( oecd/africa climate ((change expert) OR (change extent)) group papers ) or ((( oecd/rica climate channel experts group papers ) or ( oecd/america climate channel experts group papers ))))*.