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

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 political economic."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"american countries and political economy.\") OR (\"american cities and political economic.\"))".
• Removing quotes may allow a broader search: (( american countries and political economy. ) OR ( american cities and political economic. )).
• Adding a wildcard symbol may retrieve word variants: (("american countries and political economy.") OR ("american cities and political economic."))*.