Perhaps you should try some spelling variations:
chinh cong » thanh cong
trinh cong » trinh dung
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tang » hanh trang, anh tang, hanh tung
hanh mang » nhanh mang, hanh trang, nhanh lang
hoi hieu » hoi phieu, hoi tieu, moi hieu
danh van » doanh van, dang van, dinh van

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: hoi hieu lang - ((hanh tang) OR (hanh mang)) hoan ((chinh cong) OR (trinh cong)) danh van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - ((hanh tang) or (hanh mang)) hoan ((chinh cong) OR (trinh cong)) danh van ban~".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - ((hanh tang) or (hanh mang)) hoan ((chinh cong) OR (trinh cong)) danh van ban*.