Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
trung vat » trung va, trung van, trong vat
cong vang » cong lang, cong quang, cong ngang
thanh cau » thanh chau, thanh mau, nhanh cau
vat dung » van dung, va dung, viet dung
cong van » cong san, song van, cong tan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu manh) OR (hieu lang)) - thanh trung vat dung ((cong van) OR (cong vang)) thanh cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (hieu lang)) - thanh trung vat dung ((cong van) OR (cong vang)) thanh cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (hieu lang)) - thanh trung vat dung ((cong van) OR (cong vang)) thanh cau*.