32274
Historians relate the event to the shift of Cambodia 's political centre southward to the region of Phnom Penh , Longvek and later Oudong .
 Cambodia, Phnom Penh, Longvek, Oudong
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cambodia, Phnom Penh, Longvek, Oudong