Perhaps you should try some spelling variations:
hieu suat » hieu luat, hieu qua
sang lai » sang tai, sang lap, mang lai
hieu sau » tieu su, hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
lai hoa » dai hoa, loai hoc
hieu su » tieu su, hieu so, hieu qua
va hanh » van hanh, va thanh, va danh
tu sac » tu sach, tu cac, tu san
vi cua » vai cua, di cua
sac ky » cac ky, sai ky
cua te » cua tu
xu va » xu van, tu va, su va

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

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