Perhaps you should try some spelling variations:
thanh trung » thanh tung
khong cang » thong cong, hong bang, khong dung
hieu tinh » chieu tinh, lieu tinh, kieu tinh
trung ha » trung hoc, trung tam, trung cap
ha khong » hoa khong, hay khong, hua khong
tan chan » ban chan, can chan, tam chan
dan chan » dan gian, dan ca, van chat
co hieu » cao hieu, doc hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: co hieu tinh - thanh trung ha khong cang ((tan chan) or (dan chan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co hieu tinh - thanh trung ha khong cang ((tan chan) OR (dan chan)) cau.
• Adding a wildcard symbol may retrieve word variants: co hieu tinh - thanh trung ha khong cang ((tan chan) or (dan chan)) cau*.