Hello khunphan phlargkul,
It has come to our attention that invalid clicks or impressions have
been generated on the Google ads on your site(s) through users of
third-party programs paid or provided with other incentives to visit
your site. Such programs include, but are not limited to auto-surf,
pay-to-surf, pay-to-read, or pay-to-click sites.
Please bear in mind that if we continue to detect invalid clicks or
impressions from these services on your ads, we may disable your
account to protect our advertisers. In addition, we may adjust your
future payments for any days during which invalid clicks occurred in
order to properly credit advertisers for any invalid activity.
We understand that you may wish to receive specific information
regarding the invalid activity we observed on your account. However,
due to the proprietary nature of our algorithm, we cannot disclose any
details about how our monitoring technology works or what specifics we
found on your account.
As a reminder, any method of generating invalid clicks or impressions
is strictly prohibited by our Terms and Conditions and program policies:
https://www.google.com/adsense/localized-terms?hl=en_US 
https://www.google.com/adsense/policies?hl=en_US For your reference, you can find tips and guidelines for keeping your
account in good standing by visiting our Help Center at
https://www.google.com/support...r.py?answer=23921&hl=en_US .
Sincerely,
The Google AdSense Team
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