fix the issue of concatenating multiple VAD segments for en-bpe

雾聪

2023-10-10 75be3ceccdf02599c43c7e9888bfdb6ba561fc71

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hai    2
ba    3
bốn    4
năm    5
sáu    6
bảy    7
bẩy    7
tám    8
chín    9