Hello nang-dat,
I am truly sorry it has taken us so long to get back to you. We have had some difficulties that have caused messages to go unanswered. I realize this must have been very frustrating for you, and we are now working hard to fix all these issues as soon as possible.
The fastest way to find an answer to the most common Clash-related questions is by visiting our Game Support site at https://gamesupport.supercell.net/hc/en-us/categories/7122-Clash-of-Clans. Another great source of information is our Clash forum page at http://forum.supercell.net/forumdisplay.php/4-Clash-of-Clans.
If you still need our help with your issue, please reply directly to this message and we will make sure to start working on your case as soon as we can.
Please accept our apologies again for the long wait.
Wishing you a great day,