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)
"publicooaaa administration" » "publicaooaaa administration" (Expand Search), "publicoooaaa administration" (Expand Search), "publicasooaaa administration" (Expand Search), "publicooaaa administracao" (Expand Search)
"publicaaas administration" » "publicaaaas administration" (Expand Search), "publicoaaas administration" (Expand Search), "publicasaaas administration" (Expand Search), "publicaaas administracao" (Expand Search), "publicas administration" (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 (((\"publicooaaa administration\") OR (\"publicaaas administration\"))))~".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publicooaaa administration ) OR ( publicaaas administration ))))~.
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publicooaaa administration") OR ("publicaaas administration"))))*.