Perhaps you should try some spelling variations:
sang lai » sang tai, sang lap, mang lai
hieu sau » hieu su, hieu suat, tieu su
va thanh » gia thanh, ban thanh, va tinh
sau cao » sau cho, su cao, khau cao
va hanh » van hanh, va danh, ban hanh
ky sang » ky nang, ky dang, ky tang
lai hoi » dai hoi, lai hoa, lai roi
vi cua » vai cua, di cua
tu san » thu san, tu ban, tu can
cao tu » cao thu, co tu, cao su
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu san) or (tu cac)) ky sang lai hoi. hieu sau cao tu ((va hanh) OR (va thanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (tu cac)) ky sang lai hoi. hieu sau cao tu ((va hanh) OR (va thanh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) or (tu cac)) ky sang lai hoi. hieu sau cao tu ((va hanh) OR (va thanh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (tu cac)) ky sang lai hoi. hieu sau cao tu ((va hanh) OR (va thanh)) vi cua te*.