Perhaps you should try some spelling variations:
sang tao » hang tai
thu sach » tu sach, thuat sach, thuoc sach
hanh dai » hanh tai, hanh dao, vanh dai
sach ky » sac ky, sach y, sach ty
sang xa » song xa, sang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((((sang xa) or (lang xa))) or (sang tao)) hoi. hieu va pham duc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((((sang xa) OR (lang xa))) OR (sang tao)) hoi. hieu va pham duc va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((((sang xa) or (lang xa))) or (sang tao)) hoi. hieu va pham duc va hanh dai cua tre*.