51951
The VNQDĐ had previously attempted to engage in clandestine activities to undermine French rule , but increasing French scrutiny of their activities led to their leadership group taking the risk of staging a large scale military attack in the Red River Delta in northern Vietnam .
 VNQDĐ, Red River Delta, 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:
 VNQDĐ, Red River Delta, Vietnam