If you are looking for a notary in Nakhon Ratchasima, Isaan Lawyers can help you out. They are in business since 2006 with an excellent reputation.
An appointment with a Thai notary speaking English can be done directly on their website here:
More information about Thailand Public Notary can be found on their website at : http://www.isaanlawyers.com/notarial-services-korat-nakhonratchasima/
Notaries in Thailand are Thai attorney with a special license to certify documents.