Perhaps you should try some spelling variations:
thanh trung » thanh tung
cong thanh » dong thanh, cong trinh, truong thanh
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
doi hieu » doi chieu, doc hieu, doi hien
cong tan » cong tac, cong san, 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 nhung ((cong tan) 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 nhung ((cong tan) OR (cong thanh)) ((toan tap) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - thanh trung cua nhung ((cong tan) or (cong thanh)) ((toan tap) or (toan ban))*.