3 bí kíp tính bằng tay “như hack” xứng đáng truyền thụ đến muôn đời
Chẳng biết có từ bao giờ, nhưng những bí kíp này vẫn chứng minh được sự hữu dụng cho đến tận ngày hôm nay.
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