Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
canh trinh » canh tranh, hanh trinh, canh tinh
thang long » thanh cong
trinh va » trinh van, trinh vat, trinh ve
va thang » van thang, va thanh, va thong
long dan » long doan, cong dan, nong 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 trinh va thang long dan ((khan cap) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien nhanh - canh trinh va thang long dan ((khan cap) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - canh trinh va thang long dan ((khan cap) or (than cap))*.