There are several ways one of which is "Chào thân ái". This literally means "Warm greetings" but I believe it serves well as the Vietnamese equivalent of "Best wishes". Please also note that this phrase sounds quite friendly and so is widely used in a range of formality, sometimes in official letter.
Source: I am a Vietnamese.
najlepsze życzenia
Los mejores deseos
Warm wishes, (sign name) or best wishes (sign name)
Không
"Many congratulations to you both and best wishes for baby______"
a good friend
Our best wishes to you both.
Vietnamese letters and math(It`s our strongest subject) and how to write in vietnamese and read Sources:Me XD
Just write it as it's "Melbourne"
best wishes
Làm cái gì?
There are many things you can write in a congratulations card. You can write best wishes, memories of the person or bible verses. You can also find nice quotes that fit the occasion to write.