Hi Pros,
Many thank for your value idea... I hope I can learn more from your commend and I would be welcome for more advice

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Tdol,
I can say this is my first experiance to communicate with many nationality, But the difficulty for me is communicate with Indian, France, and Australia people. Thier pronounciation are difficult to understand and difficult to catch the word they said. Do you have any clue to notifies how different of english speaking of these nationality ?
Thanks for your sharing and very appreciate for your advices.
Have nice day all friends.
Davith