can not get unicode/foreign characters from server

Question

Hi Guys

I am new iphone programmer.

in iPhone, I try to get XML data from my server.

-(void)parser:(NSXMLParser *) parser foundCharacters:(NSString*) string{
    NSLog(string);
 }

My XML have format like below:

<?xml version="1.0" encoding="utf-8" ?> 
<test>
   <value1>I can get this value of element</value1>
   <value2>Không thể lấy được</value2>
</test>

I can get value in < value1 > tag

but can not get value in < value2 > tag. It have error.

I think it refer unicode/foreign characters.

Please help me.

Thank you.