Perhaps you should try some spelling variations:
sang lai » sang tai, sang lap, mang lai
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
chat luc » chat xuc, chat lua, nhan luc
hieu so » thieu so
luc van » luoc van, luu van, duc van
ky sang » ky nang, ky dang, ky tang
lai hoi » dai hoi, lai hoa, lai roi
hieu su » hieu sau, tieu su, hieu suat
cua te » cua tu
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
cua su » qua su

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)) chat luc van hanh dai ((cua te) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang lai hoi. ((hieu su) OR (hieu so)) chat luc van hanh dai ((cua te) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang lai hoi. ((hieu su) OR (hieu so)) chat luc van hanh dai ((cua te) or (cua su))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang lai hoi. ((hieu su) OR (hieu so)) chat luc van hanh dai ((cua te) or (cua su))*.