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)
"publicaaaooas administration" » "publicaaaaooas administration" (Expand Search), "publicasaaaooas administration" (Expand Search), "publicosaaaooas administration" (Expand Search), "publicaaaooas 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 (((\"publico administration\") OR (\"publicaaaooas administration\"))))~".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publico administration ) OR ( publicaaaooas administration ))))~.
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publico administration") OR ("publicaaaooas administration"))))*.