Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, hinh tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
han tai » hang tai, nhan tai, van tai
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao

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 ky ((mang xa) or (nang x)) hoi. hieu va cam tuc xa ((hanh tai) OR (han tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((mang xa) OR (nang x)) hoi. hieu va cam tuc xa ((hanh tai) OR (han tai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((mang xa) or (nang x)) hoi. hieu va cam tuc xa ((hanh tai) OR (han tai)) cua tre*".