Perhaps you should try some spelling variations:
thanh trung » thanh tung
phuong dan » phuong danh, phuong doan, huong dan
hieu lang » chieu sang, hieu quang, nhieu tang
trung bo » truong bo, trung hoc, trung hoa
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu
ho hieu » ho chieu, hoi hieu, nho hieu
bo bang » bo wang, ba bang, co bang

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 bo bang phuong dan ((than cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh trung bo bang phuong dan ((than cau) OR (phan cau)).
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh trung bo bang phuong dan ((than cau) or (phan cau))*.