គ្មានបញ្ហា

Yes, it can be used that way, but 'Ot ey te' is more common for a simple 'you're welcome.' Use 'Kmean Banh-ha' if you want to emphasize that the favor was easy for you.

Absolutely. It is professional and polite. Just make sure to use the full form: 'ខ្ញុំគ្មានបញ្ហាជាមួយចំណុចនេះទេ។'

'Kmean' is formal/written; 'Ot' is informal/spoken. Both mean 'no' or 'not have.'

'Te' is a negation particle that completes the sentence. Without it, the phrase can sound abrupt or unfinished.

No, as long as you use 'Kmean' and perhaps add 'Bong' (older sibling) or 'Lok' (Sir) at the end.

You can, but the 'face-saving' culture means people will usually assume you are being sincere. If you are annoyed, it's better to use a more specific phrase.

It's like the 'ny' in 'canyon.' Your tongue should touch the roof of your mouth.

In very casual speech, people just say 'Ot banh-ha.'

No, it specifically means there is no trouble. 'I don't care' is 'Khnom ot khwol,' which is much more negative.

No, for health, use 'Khnom ot ey te' or 'Khnom sok-sabbay.'

Yes, it is universally understood in all Khmer dialects, including Khmer Krom and Northern Khmer.

Putting 'Te' at the beginning of the sentence instead of the end.