Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
canh tinh » hanh tinh, manh tinh, canh tranh
va thang » van thang, va thanh, va hang
va thong » va thuong, va phuong, he thong
nong dan » cong dan, nong san, nguong dan
khan cap » khan ap, khoan cam, phan cac
than cap » thanh lap, thanh cac, than cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien nhanh - canh tinh ((va thang) OR (va thong)) nong dan ((khan cap) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien nhanh - canh tinh ((va thang) OR (va thong)) nong dan ((khan cap) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien nhanh - canh tinh ((va thang) OR (va thong)) nong dan ((khan cap) or (than cap))".
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - canh tinh ((va thang) OR (va thong)) nong dan ((khan cap) or (than cap))*.