Article in English: The grieving person may feel very different emotions from one day to the next, and from hour to hour.  People experience grief in very different ways. Some people may feel multiple emotions, such as denial or anger, at the same time. Some people may take awhile to feel anything at all, experiencing a sense of numbness after loss.  It is often more helpful to think of grief as a "roller coaster" instead of orderly stages. People who have experienced a loss may seem completely accepting of it one day and in denial the next. They may feel angry one moment and calm the next. It is important to validate their feelings as natural responses to loss. Although popular culture expects denial to be the first response to experiencing the loss of a loved one, research suggests otherwise. Acceptance of the death is actually much more common an initial response than denial. However, it is also possible to experience shock or denial. It all depends on the individual. The duration of shock varies greatly among individuals and across circumstances. It is important to give a person in this stage time to process information. You should acknowledge the death, but it is not necessary to force others to acknowledge the death before they are ready to do so. Research suggests that yearning for the lost loved one is a stronger initial response than disbelief, anger, or depression. This yearning may manifest itself as something like "I miss him so much" or "Life just isn't the same without her." The person may go back over old memories, photos, and other things tied to the lost loved one as a way to keep that connection alive. This is natural.  You can help by listening to these stories. Encourage the person to share her memories, if she wants to. You could even ask questions about the deceased, if the person seems interested in sharing.  You can also assure the bereaved that she could not have prevented the death. Yearning for the lost loved one may lead to bargaining, which we employ to help us feel like there is some way we can...

Summary in Vietnamese:
Bạn nên hiểu rằng sự đau buồn đối với mỗi người mỗi khác. Bạn nên biết rằng chấp nhận hoặc phủ nhận đều là phản ứng tự nhiên. Hiểu rõ khao khát muốn ở cạnh người thân yêu. Nhìn nhận sự tức giận như là cách để đối phó với nỗi đau. Quan sát dấu hiệu trầm cảm. Giúp người đó hoàn thành giai đoạn đau buồn. Cho phép người đó không bộc lộ bất kỳ điều gì.