=>
1. Children like Tet because it's a long holiday; moreover, they can also receive lucky money./Children like Tet because it's a long holiday. Moreover, they can also receive lucky money.
-> moreover : hơn nữa, ngoài ra
2. Although the buffalo-fighting Festival sounds frightening, many people come to enjoy it.
-> although S V : mặc dù
3. While the tortoise was running, the hare was sleeping./The tortoise was running while the hare was sleeping.
-> while QKTD : trong khi
4. We should keep our traditional customs.
-> should V : nên làm gì