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