Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search), "public administracao" (Expand Search)
"publicaas administration" » "publicaaas administration" (Expand Search), "publicoaas administration" (Expand Search), "publicasaas administration" (Expand Search), "publicaas administracao" (Expand Search), "publicas administration" (Expand Search), "publica administration" (Expand Search), "publicos administration" (Expand Search)
"publicoaosas administration" » "publicaoaosas administration" (Expand Search), "publicooaosas administration" (Expand Search), "publicasoaosas administration" (Expand Search), "publicoaosas 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 (((\"publicaas administration\") OR (\"publicoaosas administration\"))))~".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publicaas administration ) OR ( publicoaosas administration ))))~.
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publicaas administration") OR ("publicoaosas administration"))))*.