Perhaps you should try some spelling variations:
"public administration united state." » "public administration chile state.", "public administration study state.", "public administration italy state.", "public administration united states.", "public administration zunited states.", "public administration unitec late.", "publica administration united state."
"public administration mexico state." » "public administracion mexico state.", "public administration publica state.", "public administration spain state.", "publica administration mexico state."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("public administration united state.") or ("public administration mexico state."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("public administration united state.") OR ("public administration mexico state.")).
• Removing quotes may allow a broader search: (( public administration united state. ) or ( public administration mexico state. )).
• Adding a wildcard symbol may retrieve word variants: (("public administration united state.") or ("public administration mexico state."))*.