Perhaps you should try some spelling variations:
sang lai » sang tai, sang lap, mang lai
hieu sau » hieu suat, tieu su, hieu va
hieu su » tieu su, hieu so, hieu suat
tu sach » thu sach, su sach, te sach
ky sang » ky nang, ky dang, ky tang
lai hoi » dai hoi, lai hoa, lai roi
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua
tu sac » tu cac, tu san, tu bac
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) OR (tu sach)) ky sang lai hoi. ((hieu su) 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) OR (tu sach)) ky sang lai hoi. ((hieu su) 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) OR (tu sach)) ky sang lai hoi. ((hieu su) or (hieu sau)) chao xu va hanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) OR (tu sach)) ky sang lai hoi. ((hieu su) or (hieu sau)) chao xu va hanh vi cua tu*.