Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, hieu ve
tu sach » su sach, te sach, tu cach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
cua cua » cua chua, ca cua, qua cua
vai cua » dai cua, hai cua, lai cua
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 ma hoa. ((hieu van) OR (lieu va)) cua cua ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky tang ma hoa. ((hieu van) OR (lieu va)) cua cua ban thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky tang ma hoa. ((hieu van) OR (lieu va)) cua cua ban thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky tang ma hoa. ((hieu van) OR (lieu va)) cua cua ban thanh vai cua tre*.