Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
nguong dan » huong dan
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
tranh ban » trinh ban, tranh hang, tranh luan
cua dang » cua cong, cua ban
nong dan » cong dan, nong san, huong dan
toan ban » van ban

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 - hanh tranh cua dang ((nong dan) OR (nguong dan)) ((tranh ban) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh tranh cua dang ((nong dan) OR (nguong dan)) ((tranh ban) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh tranh cua dang ((nong dan) OR (nguong dan)) ((tranh ban) or (toan ban))*.