Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search)
"publicaasaas administration" » "publicaaasaas administration" (Expand Search), "publicoaasaas administration" (Expand Search), "publicasaasaas administration" (Expand Search)
"publicoso administracao" » "publicaoso administracao" (Expand Search), "publicooso administracao" (Expand Search), "publicasoso administracao" (Expand Search), "publicos administracao" (Expand Search), "publico administracao" (Expand Search), "publicas administracao" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("public administration") OR ("publicaasaas administration"))) OR ("publicoso administracao"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicaasaas administration\"))) OR (\"publicoso administracao\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicaasaas administration ))) OR ( publicoso administracao )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicaasaas administration"))) OR ("publicoso administracao"))*.