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)
"publicaoos administration" » "publicaaoos administration" (Expand Search), "publicoaoos administration" (Expand Search), "publicasaoos administration" (Expand Search), "publicaoos administracao" (Expand Search), "publicas administration" (Expand Search), "publicos 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 ("publicaaaas administration"))) OR ("publicaoos administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicaaaas administration\"))) OR (\"publicaoos administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicaaaas administration ))) OR ( publicaoos administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicaaaas administration"))) OR ("publicaoos administration"))*.