Perhaps you should try some spelling variations:
thanh toan » thanh hoa, tinh toan
su sach » so sach, vu sach
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
dung ha » dung va, dung he, dung khoa
y dung » ly dung, _ dung, m dung
va cam » va cac, va cao, va cai
ha hoi » hoa hoi, ha noi, xa hoi
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y dung ha hoi. lieu ((va cam) OR (va cham)) lo va ((thanh san) or (thanh toan)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y dung ha hoi. lieu ((va cam) OR (va cham)) lo va ((thanh san) OR (thanh toan)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y dung ha hoi. lieu ((va cam) OR (va cham)) lo va ((thanh san) or (thanh toan)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y dung ha hoi. lieu ((va cam) OR (va cham)) lo va ((thanh san) or (thanh toan)) cua tre*.