Perhaps you should try some spelling variations:
thuoc sach » hoc sach, thuat sach, thuoc sinh
nuoc sach » nguoi sach, hoc sach, cuoc cach
thanh van » thanh san, thanh toan, thanh phan
van cua » vang cua, ban cua, dan cua
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
ly vang » ly hang, ly van, ly quang
vang xa » lang xa, mang xa, ang xa
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cac, va cao

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

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