.form-row-quanhuyen,.form-row-tinhthanh,.form-row-phuongxa{
    width: 32%;
    float: left;
}
.form-row-quanhuyen,.form-row-tinhthanh{
    margin-right: 2%;
}
@media screen and (max-width: 768px) {
    .form-row-quanhuyen,.form-row-tinhthanh,.form-row-phuongxa{
        width: 100%;
    }
    .form-row-quanhuyen,.form-row-tinhthanh{
        margin-right: 0;
    }
}