For Traditional Chinese, the best KW info will come from Baidu. Baidu has its own KW/SEO tools baked into the backend, similar to Google’s set of tools.
I’d look at your traffic and where it’s coming from. A site I worked for had significant Trad Chinese visitation and search terms, with said traffic coming from the US. Most likely all VPN traffic. So we focused on Google & used Western SEO tools (SEMrush).
Malay you can get from Western sources, but a more local source might be better. I didn’t do any work with Malay, so don’t have actual experience there.