Here's a breakdown of the words:
* Tamil: The language itself.
* Thai: A word that can refer to Thailand, Thai people, or the Thai language.
* Vaalthu: This word is not commonly used in Tamil. It's possible it's a misspelling of another word, or a regional dialect variation.
To understand what you're trying to say, please provide more context or clarify your intention.
For example, do you mean:
* Tamil people living in Thailand?
* A Tamil language phrase or expression?
* Something else entirely?
Once you provide more information, I can help you translate or understand the meaning better.