Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
hanh trinh » canh tranh, hanh chinh
khang cong » hang cong, thanh cong, dang cong
hien xanh » hien hanh, chieu xanh, hien khanh
canh tinh » hanh tinh, manh tinh, canh tranh
van khang » van khanh, van thanh, van quang
cong dan » cong san, cong tan, huong dan
ca cau » cua cau, cac cau, can cau

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: hoc ((hien xanh) OR (hien nhanh)) - ((hanh trinh) OR (canh tinh)) van khang cong dan ca cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien nhanh)) - ((hanh trinh) or (canh tinh)) van khang cong dan ca cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (hien nhanh)) - ((hanh trinh) or (canh tinh)) van khang cong dan ca cau*.