Perhaps you should try some spelling variations:
thanh trung » thanh tung
dong trong » duong trong, dung trong, cong trong
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
trong dan » trong dang, trong san, trong tan
cua dong » chua dong, cua cong, cua dang
than cao » thai cao, than cap, than sao
toan cao » toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - thanh trung cua dong trong dan ((than cao) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh trung cua dong trong dan ((than cao) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh trung cua dong trong dan ((than cao) or (toan cao))*.