He he, first time i've come to this box, Dan à, dun worry, chuyện tiếng Việt với chính tả thì mặc kệ nó đi, nếu Dan muốn giỏi tiếng Việt thì cứ bắt chước những từ ở đây, for example: Vịt tín > tiếng Việt (not Việt tiếng). As for those who was trying to criticize you, just ignore them, anyway, language, or gramma are not real problem, all just depend on your heart (i dont think my English is good but still i use it and that might be a way to improve it).
À, ăn tới 5 cái bánh cáy à, giỏi thế (mình ăn một hoặc 2 cái đã no rồi).
Cho Dan cái web sỉte này để xem tiếng Việt
http://vdict.com/ (English- Vietnamese)
PS: don't let the language problem bother you, i once got pissed off by my Vietnamese classmate because of my bad English, since then, i hardly spoke English nor Vietnamese to those people, just be silent, i just though that i would speak English till it get better, that was catastrophic, my vocal English did not improve any little, and i got no friend either... (a part of it probably because i was unlucky to meet those stupid people like the one who had criticized you). There's only one solution for that, just ignore them, and don't be embarassed about your language. In time, it will improve.