Perhaps you should try some spelling variations:
chat duc » chat xuc, chat doc, chet duoc
thu sach » thuat sach, thuoc sach, thu hoach
ban hanh » ban hang
sang tao » hang tai
tu sach » su sach, te sach, tu cach
ban anh » ban banh, ban danh, bang anh
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
ky sang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 sang tao boi. hieu va chat duc ((ban anh) or (ban hanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky sang tao boi. hieu va chat duc ((ban anh) OR (ban hanh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky sang tao boi. hieu va chat duc ((ban anh) or (ban hanh)) di cua tre*.