Đổ thêm dầu vào lửa

Syms: add fuel to the flames = add insult to injury

I wanted to help, but I was afraid I would add fuel to the fire. Tôi thì đã muốn giúp đấy, nhưng tôi e mà đổ thêm dầu vào lửa.

The President said that he wouldn't add fuel to the fire by commenting without knowing all the facts.

I was late and, to add insult to injury, forgot my keys.