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)
"publicooas administration" » "publicoooas administration" (Expand Search), "publicasooas administration" (Expand Search), "publicosooas administration" (Expand Search), "publicooas administracao" (Expand Search), "publicas administration" (Expand Search), "publicos administration" (Expand Search)
"publica administration" » "publicoa administration" (Expand Search), "publicasa administration" (Expand Search), "publicosa administration" (Expand Search), "publica administracao" (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 (\"publicooas administration\"))) OR (\"publica administration\"))~".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicooas administration ))) OR ( publica administration ))~.
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicooas administration"))) OR ("publica administration"))*.