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)
"publicoaaos administration" » "publicaoaaos administration" (Expand Search), "publicasoaaos administration" (Expand Search), "publicosoaaos administration" (Expand Search), "publicoaaos administracao" (Expand Search), "publicaaaos administration" (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("public administration") OR ((("publico administration") OR ("publicoaaos administration"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"public administration\") OR (((\"publico administration\") OR (\"publicoaaos administration\"))))".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publico administration ) OR ( publicoaaos administration )))).
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publico administration") OR ("publicoaaos administration"))))*.