With a default (normal) shipping method all packages are sent from Thailand by AirMail (for example to the United States by USPS).
After the package delivers to Suvarnabhumi Airport (Bangkok) you may see that the tracking information stops updating. This means that the package left Thailand and now it is on its way to your country.
When the package will be delivered to your country (to customs) tracking information will start updating again. So, you’ll be able to track delivery to the destination point.
Links to the popular tracking services: