Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
canh trinh » canh tranh, hanh trinh, canh tinh
trinh phan » trinh han, trinh quan, thanh phan
thanh long » thanh cong, thanh huong, thanh hoang
thang long » thanh cong
thanh cac » hanh cac, thanh bac, thanh ca
khan cap » khan ap, than cap, khoan cam

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 phan ((thanh long) OR (thang long)) dan ((khan cap) or (thanh cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien nhanh - canh trinh phan ((thanh long) OR (thang long)) dan ((khan cap) OR (thanh cac)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien nhanh - canh trinh phan ((thanh long) OR (thang long)) dan ((khan cap) or (thanh cac))".
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - canh trinh phan ((thanh long) OR (thang long)) dan ((khan cap) or (thanh cac))*.