Perhaps you should try some spelling variations:
sach ky » sac ky, sach ty, sach kem
hieu va » lieu va, hieu qua
xuc ban » duc ban, cuc ban, quoc ban
ban anh » ban hanh, ban banh, ban danh
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
x hoi » o hoi, x ho, 5 hoi
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 (sach y)) nang ((x hoi) OR (xa hoi)). hieu va cam xuc ban anh d cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang ((x hoi) OR (xa hoi)). hieu va cam xuc ban anh d cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang ((x hoi) OR (xa hoi)). hieu va cam xuc ban anh d cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang ((x hoi) OR (xa hoi)). hieu va cam xuc ban anh d cua tre*.