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