I don't like to advertise, but like to give information about good websites.
Have a look at www.worldtoeic.com
If you are serious about training for the TOEIC. Go and have a look. They are offering a FREE trial.

I have pasted below part of their website. maybe someone can translate it to vietnamese?

TOEIC Vocabulary
TOEIC Photographs
TOEIC Question and Answer
TOEIC Short Conversations
TOEIC Short Talks
TOEIC Incomplete Sentence
TOEIC Error Recognition
TOEIC Single Passage
TOEIC Double Passage
TOEIC Speaking Module
TOEIC Placement & Estimate Test
TOEIC English Refresher Exercises
TOEIC Idiom centre
Concentrate your learning
TOEIC placement and practice test
See your TOEIC performance in each section of the test
TOEIC tips and advice
Hundreds of TOEIC questions
Male and female Voices.
Various native accents British, American, Australian, Canadian
Including TOEIC speaking module exercises
Qualified TOEIC trainer support
Unique Performance Monitor
Let's Learn English Exercises
English Idiom Hangman Hundreds of Idioms.