He has lost his passport. 
Anh ấy đã đánh mất hộ chiếu của anh ấy. * 069 like: đánh mất → →
We lost him in the narrow streets and had to give up the chase (= stop chasing him). ☊ chase ☊
They lost everything that was dear to them. ☊ dear ☊
Whatever you do, don't lose your sense of humour. ☊ humour ☊
Don't lose it — it's special. ☊ special ☊