Caused by / By, used to express the cause-result relationship, the origin or the state of dependence of things.
|Món nem này do tôi làm.|
|The meat roll is made by me.|
|Anh ấy bị đau dạ dày do uống quá nhiều rượu.|
|He has a stomachache due to drinking too much alcohol.|
The conjunction "do" can be placed at the beginning of a sentence to express the cause.
|Do uống nhiều rượu nên anh ấy bị đau dạ dày.|
|Because he drank a lot of alcohol, he had a stomachache.|