Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
doi hieu » doi chieu, doc hieu, doi hien
cua dung » cua dang, cua dong, qua dung
cong ban » cong bang, cong san, cong tan
than cau » toan cau, phan cau, than cap
toan ban » van ban

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

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