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)
"publicasa administration" » "publicaasa administration" (Expand Search), "publicasasa administration" (Expand Search), "publicosasa administration" (Expand Search), "publicasa administracao" (Expand Search), "publicas administration" (Expand Search), "publica 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 (((\"publico administration\") OR (\"publicasa administration\"))))~".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publico administration ) OR ( publicasa administration ))))~.
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publico administration") OR ("publicasa administration"))))*.