Perhaps you should try some spelling variations:
"public administration" » "publico administration" (Expand Search), "publicas administration" (Expand Search), "publicos administration" (Expand Search), "public administracao" (Expand Search)
"publica administration" » "publicoa administration" (Expand Search), "publicasa administration" (Expand Search), "publicosa administration" (Expand Search), "publica administracao" (Expand Search)
"publicaoas administration" » "publicoaoas administration" (Expand Search), "publicasaoas administration" (Expand Search), "publicosaoas administration" (Expand Search), "publicaoas administracao" (Expand Search), "publicas administration" (Expand Search), "publicos 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 (((\"publica administration\") OR (\"publicaoas administration\"))))~".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publica administration ) OR ( publicaoas administration ))))~.
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publica administration") OR ("publicaoas administration"))))*.