Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publicas administration" (Expand Search), "publicos administration" (Expand Search), "public administracao" (Expand Search)
"publico administration" » "publicao administration" (Expand Search), "publicaso administration" (Expand Search), "publicoso administration" (Expand Search), "publico administracao" (Expand Search), "publica administration" (Expand Search)
"publicosaaaa administration" » "publicaosaaaa administration" (Expand Search), "publicasosaaaa administration" (Expand Search), "publicososaaaa administration" (Expand Search), "publicosaaaa administracao" (Expand Search), "publicasaaaa 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 ("publico administration"))) OR ("publicosaaaa administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publico administration\"))) OR (\"publicosaaaa administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publico administration ))) OR ( publicosaaaa administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publico administration"))) OR ("publicosaaaa administration"))*.