Perhaps you should try some spelling variations:
thanh trung » thanh tung
cong thanh » dong thanh, cong trinh, cong tan
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
doi hieu » doi chieu, doc hieu, doi hien
cua tong » cua cong, cua dong, cua nong
cong tac » cong ty
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 tong ((cong tac) or (cong thanh)) ((toan tap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - thanh trung cua tong ((cong tac) OR (cong thanh)) ((toan tap) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - thanh trung cua tong ((cong tac) or (cong thanh)) ((toan tap) or (toan ban))*.