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

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 ((((sang xa) or (dang xay))) 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: tu sach ky ((((sang xa) OR (dang xay))) OR (sang tao)) hoi. hieu va pham duc va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((((sang xa) or (dang xay))) or (sang tao)) hoi. hieu va pham duc va hanh dai cua tre*.