Alice,
I am not sure how fluent any one of us is in Vietnamese, so communication might be a little tough!!
I think I would react if I find my stuff posted happily at some English ( or in my case German) speaking Orchid vendor's website without contacting me first. Other than that, whatever?
I also posted the said photo at the Orchidsource forum, where it is much easier to lift a photo than on ATP. On our Forum you would have to scroll through plenty of stuff, where at the OSF site you will see it instantly. Most likely that is where it was lifted.