Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
trung tao » trong tao, trung tai, trung tuan
hoi hieu » hoi phieu, hoi tieu, moi hieu
van cong » van dong, van phong, phan cong
cong tac » cong ty
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - thanh ((trung tao) OR (trung tam)) van cong tac ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - thanh ((trung tao) OR (trung tam)) van cong tac ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - thanh ((trung tao) OR (trung tam)) van cong tac ((toan cau) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - thanh ((trung tao) OR (trung tam)) van cong tac ((toan cau) or (toan tap))*.