What about documents issued in a third country and not written in Thai?
Use a translator credentialled in that specific language pair. Relaying through an intermediate language degrades accuracy and can be queried by the receiving body.
In-depth Answer
Many applicants hold documents from more than one country — an employment reference from a country they worked in, or a police clearance from a country they lived in.
These also need English translations, and the same principle applies: the translator must hold a credential in the exact language pair and direction.
Avoid relay translation, where the text goes into Thai first and then into English, because errors compound and the stamp will not reflect the source document's actual language pair.
Where no credential holder exists for that pair, the fallback is a translator who meets the requirements for translators outside Australia by stating full name, address, contact details, and qualifications — and it is worth confirming with the receiving body before proceeding.
Related questions
Documents most Australia visa applicants translate into English
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