Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hang tai » hang va, dung tai
thu sach » thuat sach, thuoc sach, thu hoach
hanh vai » hanh vi, hanh va, hanh tai
sang tai » sang tao, tang tai, sang than
vai cua » dai cua, hai cua, lai cua
xa hanh » xa thanh, xa khanh, va hanh
vien da » vien dai, hien dai
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
da tuc » dao tuc, va tuc, da tac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ky ((sang tai) OR (hang tai)) hai. hieu vien da tuc xa hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky ((sang tai) OR (hang tai)) hai. hieu vien da tuc xa hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky ((sang tai) OR (hang tai)) hai. hieu vien da tuc xa hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky ((sang tai) OR (hang tai)) hai. hieu vien da tuc xa hanh vai cua tre*.