Perhaps you should try some spelling variations:
"american countries and political economy." » "african countries and political economy.", "asian countries and political economy.", "american countries and political economic."
"american cities and ecological economics." » "african cities and ecological economics.", "american studies and ecological economics.", "american cities and technological economics.", "american cities and 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: (("american countries and political economy.") or ("american cities and ecological economics."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("american countries and political economy.") OR ("american cities and ecological economics.")).
• Removing quotes may allow a broader search: (( american countries and political economy. ) or ( american cities and ecological economics. )).
• Adding a wildcard symbol may retrieve word variants: (("american countries and political economy.") or ("american cities and ecological economics."))*.