Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham cac » cho cac, cham soc, cua cac
ban danh » ban doanh, ban hanh, ban dan
tu sach » thu sach, su sach, te sach
cac ban » cac dan, cac van, can ban
danh te » danh tu, danh het, danh yen
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
te cua » tue cua, le cua, de cua
x hoi » o hoi, x ho, 5 hoi

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 y nang ((x hoi) or (xa hoi)). hieu qua cham cac ban danh te cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (xa hoi)). hieu qua cham cac ban danh te cua tre*.