Hello tranthidung. I spotted a small typo in the OP
I much appreciated your findings and this report. They are helpful. Never see those typos after months. I already fixed them in OP.
For this part I'd recommend also a few topics, all being related to forum's history; feel free to add them, if you consider suitable. I also tried to sort them by category:
I thank you again. They are informative historic topics and I recalled that I saw them a while ago in another thread (not remembered who made that compilation thread).
I won't add them here but if there is no compilation thread for it, I gonna create one. Let me check.