Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
canh doanh » hanh doanh, chinh doanh, doanh doanh
hien xanh » hien hanh, chieu xanh, hien khanh
cua khong » cua phuong, cua thuong, cua cong
hua khong » hoa khong, hoac khong, phuc khong
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao 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: hoc ((hien xanh) OR (hien nhanh)) - canh doanh ((cua khong) OR (hua khong)) cong dan van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien nhanh)) - canh doanh ((cua khong) OR (hua khong)) cong dan van ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien nhanh)) - canh doanh ((cua khong) OR (hua khong)) cong dan van ban*.