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