So you are in the Vietnam but Vietnam always hate Cambodia I was in Cambodia because
Historical tensions, cross-border violence, and conflicts stemming from the Cambodian–Vietnamese War have created deep-seated animosity between Vietnam and Cambodia. Historically, Cambodia's Khmer Rouge conducted massacres of Vietnamese civilians, leading to a 1978 Vietnamese invasion that overthrew them. Mutual distrust persists due to past border disputes and ethnic tensions, say the Wikipedia sources and Cambodia–Vietnam relations.
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Khmer Rouge Aggression: The Khmer Rouge in Cambodia during the 1970s targeted ethnic Vietnamese, massacring tens of thousands of civilians and calling for the extermination of the Vietnamese population.
The 1978 War: These border raids and massacres, including the 1978 Ba Chúc massacre (where 3,157 Vietnamese villagers were killed), prompted a full-scale invasion of Cambodia by Vietnam.
Occupation and Distrust: Vietnam occupied Cambodia for over