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)
"publicaaaaas administration" » "publicaaaaaas administration" (Expand Search), "publicoaaaaas administration" (Expand Search), "publicasaaaaas administration" (Expand Search), "publicaaaaas administracao" (Expand Search)
"publicoaa administration" » "publicaoaa administration" (Expand Search), "publicooaa administration" (Expand Search), "publicasoaa administration" (Expand Search), "publicoaa administracao" (Expand Search), "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (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 ("publicaaaaas administration"))) OR ("publicoaa administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicaaaaas administration\"))) OR (\"publicoaa administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicaaaaas administration ))) OR ( publicoaa administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicaaaaas administration"))) OR ("publicoaa administration"))*.