Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
dang xay » dang van, van xay
va thanh » gia thanh, ban thanh, va tinh
vai cua » dai cua, hai cua, lai cua
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
lang ha » long ha
nang ma » tang ma, sang ma, nang cao
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: tu sach ky ((nang ma) or (((lang ha) or (dang xay)))) hoi. hieu va pham duc va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (((lang ha) OR (dang xay)))) hoi. hieu va pham duc va thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) or (((lang ha) or (dang xay)))) hoi. hieu va pham duc va thanh vai cua tre*.