Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
van cong » van dong, van phong, phan cong
cong tac » cong ty
tam van » nam van, dam van, tom van
tac van » tac vang, cac van, tac va
van cau » van dau, van hau, van chat

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) or (chieu sach)) - thanh trung tam van cong tac van cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chieu sach)) - thanh trung tam van cong tac van cau.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chieu sach)) - thanh trung tam van cong tac van cau*.