Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
va thanh » gia thanh, ban thanh, va tinh
ban hanh » ban hang
tu sach » su sach, te sach, tu cach
vai cua » dai cua, hai cua, lai cua
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
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) or (thu sach)) ky tang xa hoi. hieu va cac xuc ((ban hanh) or (va thanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky tang xa hoi. hieu va cac xuc ((ban hanh) OR (va thanh)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky tang xa hoi. hieu va cac xuc ((ban hanh) or (va thanh)) vai cua tre*.