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)
"publicoaas administration" » "publicaoaas administration" (Expand Search), "publicooaas administration" (Expand Search), "publicasoaas administration" (Expand Search), "publicoaas administracao" (Expand Search), "publicas administration" (Expand Search), "publicos administration" (Expand Search), "publicass administration" (Expand Search)
"publicoaa administration" » "publicaoaa administration" (Expand Search), "publicooaa administration" (Expand Search), "publicasoaa administration" (Expand Search), "publicoaa administracao" (Expand Search), "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas 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 (\"publicoaas administration\"))) OR (\"publicoaa administration\"))~".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicoaas administration ))) OR ( publicoaa administration ))~.
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicoaas administration"))) OR ("publicoaa administration"))*.