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