Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
thanh van » thanh san, thanh phan, thanh nhan
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
sach ly » sach y, sach lo, sach ty
vang xa » lang xa, mang xa, ang xa
ly vang » ly hang, ly van, ly quang
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao

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

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