Perhaps you should try some spelling variations:
"american countries and political economic." » "american countries and policy economic.", "american countries and ecological economics.", "african countries and political economic.", "asian countries and political economic."
"african cities and political economy." » "african countries and political economy."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("african cities and political economy.") or ("american countries and political economic."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("african cities and political economy.") OR ("american countries and political economic.")).
• Removing quotes may allow a broader search: (( african cities and political economy. ) or ( american countries and political economic. )).
• Adding a wildcard symbol may retrieve word variants: (("african cities and political economy.") or ("american countries and political economic."))*.