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)
"publicoosas administration" » "publicaoosas administration" (Expand Search), "publicasoosas administration" (Expand Search), "publicosoosas administration" (Expand Search), "publicaosas 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 (\"publicoosas administration\"))))~".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publico administracao ) OR ( publicoosas administration ))))~.
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publico administracao") OR ("publicoosas administration"))))*.