For bros who do business in VN, you should have realised that VN is one of the few countries in the world without postal codes. Some years ago, China was without postal code too, but they gradually changed and postal codes were introduced throughout the country.
Come to my `situ bi' Dalat University staff again. She suggested to my wifey that its too expensive to use DHL to send documents from SGN to SIN, so she recommended us to use VN Postal. I gave her my SIN address with the postal code and everything. After 20 days, the documents didn't arrived and i was wondering what went wrong.. efforts to trace the documents were fruitless. finally by the 25th day, the document arrived. On the document, she wrote the Singapore postal code as my Telephone number. Troi oi, how situ bi can she get. I asked her why the staff at the postal services also don't know? She said the staff just followed whatever she wrote.
(btw, if use DHL, it only takes 24 hours)