Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicos administration" (Expand Search)
"publicas administracao" » "publicaas administracao" (Expand Search), "publicoas administracao" (Expand Search), "publicosas administracao" (Expand Search), "publica administracao" (Expand Search), "publico administracao" (Expand Search)
"publicoas administration" » "publicaoas administration" (Expand Search), "publicooas administration" (Expand Search), "publicosoas administration" (Expand Search), "publicos administration" (Expand Search), "publica administration" (Expand Search), "publico administration" (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"public administration\") OR (((\"publicas administracao\") OR (\"publicoas administration\"))))~".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publicas administracao ) OR ( publicoas administration ))))~.
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publicas administracao") OR ("publicoas administration"))))*.