Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicos administration" (Expand Search), "public administracao" (Expand Search)
"publicas administration" » "publicaas administration" (Expand Search), "publicoas administration" (Expand Search), "publicosas administration" (Expand Search), "publicas administracao" (Expand Search), "publica administration" (Expand Search), "publico administration" (Expand Search)
"publicosoos administration" » "publicaosoos administration" (Expand Search), "publicoosoos administration" (Expand Search), "publicososoos administration" (Expand Search), "publicosoos 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 (((\"publicas administration\") OR (\"publicosoos administration\"))))~".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publicas administration ) OR ( publicosoos administration ))))~.
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publicas administration") OR ("publicosoos administration"))))*.