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