Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search), "public administracao" (Expand Search)
"publicaasaas administration" » "publicaaasaas administration" (Expand Search), "publicoaasaas administration" (Expand Search), "publicasaasaas administration" (Expand Search), "publicaasaas administracao" (Expand Search)
"publicoso administration" » "publicaoso administration" (Expand Search), "publicooso administration" (Expand Search), "publicasoso administration" (Expand Search), "publicoso administracao" (Expand Search), "publicos administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (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 administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicaasaas administration\"))) OR (\"publicoso administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicaasaas administration ))) OR ( publicoso administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicaasaas administration"))) OR ("publicoso administration"))*.