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)
"publicaaaas administration" » "publicaaaaas administration" (Expand Search), "publicasaaaas administration" (Expand Search), "publicosaaaas administration" (Expand Search), "publicaaaas administracao" (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 ("publicaaaas administration"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"public administration\") OR (((\"publico administration\") OR (\"publicaaaas administration\"))))".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publico administration ) OR ( publicaaaas administration )))).
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publico administration") OR ("publicaaaas administration"))))*.