Perhaps you should try some spelling variations:
"oecd economics department boards panels" » "oecd economics department board panels"
"oecd economics experimenter boards papers" » "oecd economics experimenter board papers", "oecd economics experimenters boards papers", "oecd economics experimente boards papers", "oecd economics experimenten boards papers"
"oecd economics experimenter adams papers" » "oecd economics experimenters adams papers", "oecd economics experimente adams papers", "oecd economics experimenten adams 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 economics department boards panels") OR ((("oecd economics experimenter adams papers") OR ("oecd economics experimenter boards papers")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"oecd economics department boards panels\") or (((\"oecd economics experimenter adams papers\") OR (\"oecd economics experimenter boards papers\"))))".
• Removing quotes may allow a broader search: (( oecd economics department boards panels ) or ((( oecd economics experimenter adams papers ) OR ( oecd economics experimenter boards papers )))).
• Adding a wildcard symbol may retrieve word variants: (("oecd economics department boards panels") or ((("oecd economics experimenter adams papers") OR ("oecd economics experimenter boards papers"))))*.