The [/quote] has to be on its own line.
[quote=“Toan Nguyen, post:12, topic:327071, username:toanvoc”]
replying using quote
[/quote] doesn’t work
[quote="Toan Nguyen, post:12, topic:327071, username:toanvoc"]
replying using quote
[/quote]
works
works
In general, it is easier to keep track of your problems if you describe them in separate topics. Then we can mark things that are fixed and it is less likely something gets overlooked