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The Sa Huỳnh culture ( Vietnamese : Văn hóa Sa Huỳnh ) was a culture in modern-day central and southern Vietnam that flourished between 1000 BC and 200 AD .
 Vietnam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vietnam