156218
In 1982 , Vietnam launched a largely unsuccessful offensive against the main Khmer Rouge base at Phnom Malai in the Cardamom Mountains .
 Vietnam, Phnom Malai
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, Phnom Malai