It’s not late to send greeting card now. http://ecards.vietunited.com/
For Vietnamese, get your mom a karaoke system http://www.besthotitems.com/category/karaoke-package/ or cook some good Vietnamese food for her http://vn.cookingrecipedb.com/
This holiday is relatively modern, being created at the start of the 20th century, and should not be confused with the early pagan and Christian traditions honoring mothers, or with the 16th century celebration of Mothering Sunday, which is also known as Mother’s Day in the UK.
In most countries the Mother’s Day celebration is a recent holiday derived from the Mothering Sunday holiday in the UK.
It is celebrated in Australia, Malaysia, Canada, and United States each year on the second Sunday of May.