i have the similar problem. My voca is:

% NS_B

<s> sil

% NS_E

</s> sil

% CALL_V

GỌI g ọi 

% DIAL_V

BẤM b ấ m

% NAME_N

KHÁNH kh á nh

HÀ h à

THẦY th ầ y

ĐẠT đ ạ t

LINH l i nh

% DIGIT

KHÔNG kh ô ng

MỘT m ộ t

HAI h ai

BA b a

BỐN b ố n

NĂM n ă m

SÁU s á u 

BẢY b ả y

TÁM t á m

CHÍN ch í n

MƯỜI m ườ i