Perhaps you should try some spelling variations:
economic debasement » economic measurement, economic appeasement, economic management
economic experiment » economic experiments, economics experiments, economic empowerment
experiment boarding » experiment learning, experiment aiding, experiment building
boarding papers » boarding pass, boarding passes, learning papers

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 economic debasement ((working papers) OR (working paper)) ) OR ( oecd economic experiment boarding papers )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( oecd economic debasement ((working papers) OR (working paper)) ) or ( oecd economic experiment boarding papers ))".
• Adding a wildcard symbol may retrieve word variants: (( oecd economic debasement ((working papers) OR (working paper)) ) or ( oecd economic experiment boarding papers ))*.