Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh van » thanh san, thanh toan, thanh phan
thu sach » tu sach, thuat sach, thu hoach
va thanh » gia thanh, ban thanh, va tinh
va cham » va chat, va tham
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
vang xa » lang xa, mang xa, ang xa
va cam » va cac, va cao, va cai
xuc va » duc va, tuc va, luc va
y vang » ly vang

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 vang xa hoi. hieu ((va cam) or (va cham)) xuc va thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) y vang xa hoi. hieu ((va cam) OR (va cham)) xuc va thanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) y vang xa hoi. hieu ((va cam) or (va cham)) xuc va thanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) y vang xa hoi. hieu ((va cam) or (va cham)) xuc va thanh van cua tre*.