số không 
zero 
You have to dial a zero first! 
Bạn phải gọi số không trước. * 061 like: số không → →
null ☊ số không ☊ 
零 ☊ líng null ☊ số không ☊ ☊ add A and B together: If you add all these amounts together you get a huge figure. ☊ add ☊
'Is there any left?' 'I'm afraid not.' ☊ I'm afraid ☊
to draw/draw back/pull back the curtains (= to open them, so that the window is no longer covered) ☊ curtain ☊
The window wouldn't fasten. ☊ fasten ☊
Discussions are held on an informal basis within the department. ☊ informal ☊
'Is it ready?' 'I'm afraid not.' ☊ not ☊
Thirteen is often considered an unlucky number. ☊ unlucky ☊
I rated my chances as zero. ☊ zero ☊