Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
hang vai » hang va, hang tai, hang hai
ban hang » ngan hang
vai cua » dai cua, hai cua, lai cua
lua ban » luat ban, luan ban, cua ban
cay lua » vay luan
cua tre » cua te, cuu tre, cua triet
va cay » va cac, va cao, va cai
ma hoi » mai hoi, xa hoi, me hoi
y nang » ky nang, ly nang, v nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (thuoc sach)) y nang ((ma hoi) or (ma hoa)). lieu va cay lua ban hang vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) y nang ((ma hoi) OR (ma hoa)). lieu va cay lua ban hang vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) y nang ((ma hoi) or (ma hoa)). lieu va cay lua ban hang vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) y nang ((ma hoi) or (ma hoa)). lieu va cay lua ban hang vai cua tre*.