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)
"publicaas administration" » "publicaaas administration" (Expand Search), "publicoaas administration" (Expand Search), "publicasaas administration" (Expand Search), "publicaas administracao" (Expand Search), "publicas administration" (Expand Search), "publica administration" (Expand Search), "publicos administration" (Expand Search)
"publicooaaa administration" » "publicaooaaa administration" (Expand Search), "publicoooaaa administration" (Expand Search), "publicasooaaa administration" (Expand Search), "publicooaaa 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 ("publicaas administration"))) OR ("publicooaaa administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicaas administration\"))) OR (\"publicooaaa administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicaas administration ))) OR ( publicooaaa administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicaas administration"))) OR ("publicooaaa administration"))*.