Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicos administration" (Expand Search), "public administracao" (Expand Search)
"publicoaaa administration" » "publicaoaaa administration" (Expand Search), "publicooaaa administration" (Expand Search), "publicosoaaa administration" (Expand Search), "publicoaaa administracao" (Expand Search)
"publicas administration" » "publicaas administration" (Expand Search), "publicoas administration" (Expand Search), "publicosas administration" (Expand Search), "publicas administracao" (Expand Search), "publica administration" (Expand Search), "publico 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 (((\"publicoaaa administration\") OR (\"publicas administration\"))))~".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publicoaaa administration ) OR ( publicas administration ))))~.
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publicoaaa administration") OR ("publicas administration"))))*.