Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search), "public administracao" (Expand Search)
"publicaaaas administration" » "publicaaaaas administration" (Expand Search), "publicoaaaas administration" (Expand Search), "publicasaaaas administration" (Expand Search), "publicaaaas administracao" (Expand Search)
"publicoaoos administration" » "publicaoaoos administration" (Expand Search), "publicooaoos administration" (Expand Search), "publicasoaoos administration" (Expand Search), "publicoaoos 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 ((("publicaaaas administration") OR ("publicoaoos administration"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"public administration\") OR (((\"publicaaaas administration\") OR (\"publicoaoos administration\"))))".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publicaaaas administration ) OR ( publicoaoos administration )))).
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publicaaaas administration") OR ("publicoaoos administration"))))*.