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