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)
"publico administration" » "publicao administration" (Expand Search), "publicaso administration" (Expand Search), "publicoso administration" (Expand Search), "publico administracao" (Expand Search), "publica administration" (Expand Search)
"publicososo administration" » "publicaososo administration" (Expand Search), "publicasososo administration" (Expand Search), "publicosososo administration" (Expand Search), "publicososo administracao" (Expand Search), "publicasoso 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 (((\"publico administration\") OR (\"publicososo administration\"))))~".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publico administration ) OR ( publicososo administration ))))~.
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publico administration") OR ("publicososo administration"))))*.