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)
"publicoas administration" » "publicaoas administration" (Expand Search), "publicooas administration" (Expand Search), "publicasoas administration" (Expand Search), "publicoas administracao" (Expand Search), "publicas administration" (Expand Search), "publicos administration" (Expand Search), "publica administration" (Expand Search)
"publicoaaos administration" » "publicaoaaos administration" (Expand Search), "publicooaaos administration" (Expand Search), "publicasoaaos administration" (Expand Search), "publicoaaos 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 (\"publicoas administration\"))) OR (\"publicoaaos administration\"))~".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicoas administration ))) OR ( publicoaaos administration ))~.
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicoas administration"))) OR ("publicoaaos administration"))*.