Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publicas administration" (Expand Search), "publicos administration" (Expand Search)
"publico administracao" » "publicao administracao" (Expand Search), "publicaso administracao" (Expand Search), "publicoso administracao" (Expand Search), "publica administracao" (Expand Search)
"publicoas administration" » "publicaoas administration" (Expand Search), "publicasoas administration" (Expand Search), "publicosoas administration" (Expand Search), "publicaas administration" (Expand Search), "publicas administration" (Expand Search), "publicos administration" (Expand Search), "publica 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 (((\"publico administracao\") OR (\"publicoas administration\"))))~".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publico administracao ) OR ( publicoas administration ))))~.
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publico administracao") OR ("publicoas administration"))))*.