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

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