Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
hien xanh » hien hanh, chieu xanh, hien khanh
quan dang » quang dang, quan lang, tuan dang
quan dong » quang dong, quan long, quan hoang
canh ban » can ban, canh dan, canh van
cong van » cong vang, cong san, song van
van than » van thanh, van thang, van tuan
than cau » toan cau, phan cau, than cap

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)) - canh ban ((quan dang) OR (quan dong)) cong van than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien nhanh)) - canh ban ((quan dang) OR (quan dong)) cong van than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien nhanh)) - canh ban ((quan dang) OR (quan dong)) cong van than cau*.