Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham dua » chay dua, cham giua, pham duc
sach ky » sach y, sach ty, sach kem
dua ban » dia ban, cua ban, qua ban
ban anh » ban hanh, ban banh, ban danh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
o hoi » co hoi, o hoc, o hai
d cua » de cua, do cua, da 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 ky) OR (sac ky)) nang ((o hoi) or (xa hoi)). hieu qua cham dua ban anh d cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang ((o hoi) OR (xa hoi)). hieu qua cham dua ban anh d cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang ((o hoi) or (xa hoi)). hieu qua cham dua ban anh d cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) nang ((o hoi) or (xa hoi)). hieu qua cham dua ban anh d cua tre*.