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