Perhaps you should try some spelling variations:
hieu sau » hieu suat, tieu su, hieu va
sang lai » sang tai, sang lap, mang lai
ky sang » ky nang, ky dang, ky tang
lai hoi » dai hoi, lai hoa, lai roi
hieu su » tieu su, hieu suat, hieu qua
va hanh » van hanh, va thanh, va danh
hieu so » thieu so
tu sac » tu sach, tu cac, tu san
vi cua » vai cua, di cua
sac ky » cac ky, sai ky
cua tu » cua tuc, cua su, cua cu
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 hoi. ((((hieu su) OR (hieu so))) or (hieu sau)) chao xu va hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang lai hoi. ((((hieu su) OR (hieu so))) OR (hieu sau)) chao xu va hanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang lai hoi. ((((hieu su) OR (hieu so))) or (hieu sau)) chao xu va hanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang lai hoi. ((((hieu su) OR (hieu so))) or (hieu sau)) chao xu va hanh vi cua tu*.