Perhaps you should try some spelling variations:
"independent studies in political economy." » "independent states in political economy.", "independent audits in political economy.", "independent bodies in political economy.", "independent studies in political economic."
"Independent studies in ecological economics." » "Independent studies in ecological economic."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("independent studies in political economy.") or ("Independent studies in ecological economics."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("independent studies in political economy.") OR ("Independent studies in ecological economics.")).
• Removing quotes may allow a broader search: (( independent studies in political economy. ) or ( Independent studies in ecological economics. )).
• Adding a wildcard symbol may retrieve word variants: (("independent studies in political economy.") or ("Independent studies in ecological economics."))*.