Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban danh » ban doanh, ban hanh, ban dan
nang som » nang song, nang soan, nang doc
danh di » danh du, xanh di, danh dien
xuc ban » duc ban, cuc ban, quoc ban
som hai » son hai, so hai, soat hai
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cao, va cai
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: ((te sach) OR (toc sach)) ty nang som hai. hieu ((va cam) or (va cac)) xuc ban danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang som hai. hieu ((va cam) OR (va cac)) xuc ban danh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty nang som hai. hieu ((va cam) or (va cac)) xuc ban danh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty nang som hai. hieu ((va cam) or (va cac)) xuc ban danh di cua tre*.