The large island country east of Vietnam is the Philippines.
Vietnam
The country located at 15 degrees latitude east of Vietnam is Laos.
Laos is the country that lies to the north and east of Vinh, a city in Vietnam.
Vietnam is to the East of Laos and extends both North and South of it.
The Philippines
No. Vietnam is not a part of Australia. It is the easternmost country on the Indochina Peninsula in Southeast Asia.
Viet Nam is directly east of Cambodia.
Vietnam
Vietnam is geographically on the borderline of east asia and se asia. Vietnam is the only country in se asia that can also be categorically part of east asia. Vietnam's people and culture is east asian, but geographically located in the borderline of se asia/east asia.
Viet Nam is not in a country, it is a country in south east Asia.
The war in Vietnam was unsuccessful. But it halted the Communist advance in South East Asia. Without the Vietnam war, the entire south east asia would be red with blood.