Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cong hai » cong thai, cong ha, hoang hai
duc ban » duc tan, duc van, dua ban
xuc ban » cuc ban, quoc ban, xuat ban
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
anh di » danh di, xanh di, anh d
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: toc sach ky nang ((son hai) or (cong hai)). hieu va cham ((xuc ban) or (duc ban)) anh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ((son hai) OR (cong hai)). hieu va cham ((xuc ban) OR (duc ban)) anh di cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((son hai) or (cong hai)). hieu va cham ((xuc ban) or (duc ban)) anh di cua tre*.