Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, nhieu tang
dung chung » dung cong, dung ung, dung trung
hieu lang » hieu quang, nhieu tang, hieu van
trung son » truong son, trung uong, trung hoc
chung van » phung van, nhung van, chung han
van thanh » ban thanh, van tuan
thanh cap » thanh lap, hanh cap, than cap
son dung » son duong, so dung, son tung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (hieu lang)) - thanh trung son dung chung van thanh cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - thanh trung son dung chung van thanh cap.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu lang)) - thanh trung son dung chung van thanh cap*.