Perhaps you should try some spelling variations:
sang lai » sang lap, mang lai, sang mai
hanh vai » hanh vi, hanh va, hanh tai
sang tai » hang tai, sang tao, tang tai
hieu su » hieu sau, hieu so, hieu suat
tieu su » thieu so
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
tu bai » tu ban, tu bat, te bai
bai ky » ban ky, sai ky, bac 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 bai ky ((sang lai) or (sang tai)) hoi. ((hieu su) OR (tieu su)) chao xu va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky ((sang lai) OR (sang tai)) hoi. ((hieu su) OR (tieu su)) chao xu va hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bai ky ((sang lai) or (sang tai)) hoi. ((hieu su) OR (tieu su)) chao xu va hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu bai ky ((sang lai) or (sang tai)) hoi. ((hieu su) OR (tieu su)) chao xu va hanh vai cua te*.