Code chơi

const node = document.createElement("div");
node.style.display = 'flex';
node.style.flexWrap = 'wrap';
let item = document.querySelectorAll('.fR2ZHc.Lm0qRJ');
for (let index = 0; index < item.length; index++) {
    let priceNode = item[index].querySelector('.bkz28I');
    let number = priceNode.innerText.replaceAll('₫\n', '');
    number = number.replaceAll('.', '');
    if (number < 11000) {
        if (item[index]) {
            console.log(number);
            console.log(item[index]);
            node.appendChild(item[index]);
        }
    }
}

let itemFlash = document.querySelector('.uqKrnc.TyE46o');
itemFlash.appendChild(node);
itemFlash.style.display = 'flex';
itemFlash.style.flexDirection = 'column';