You need to check out the French Indochina War (1946-1954) not the Vietnam War (1957-1975).

"Results": [
    {
        "TypeName": "LOC",
        "Text": "Indochina",
        "Start": 33,
        "End": 42
    },
    {
        "TypeName": "LOC",
        "Text": "Vietnam",
        "Start": 67,
        "End": 74
    }
]