Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
thanh hai » thanh phan, thanh hoa, thanh san
cua tre » cua te, cuu tre, cua triet
duc ban » duc tan, duc van, dua ban
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, kho tang
sac ky » cac ky, sai ky
hieu v » hieu va, hieu 2, hieu _
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky tang xa hoi. ((hieu v) OR (hieu ve)) pham duc ban ((thanh hai) or (thanh toan)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang xa hoi. ((hieu v) OR (hieu ve)) pham duc ban ((thanh hai) OR (thanh toan)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang xa hoi. ((hieu v) OR (hieu ve)) pham duc ban ((thanh hai) or (thanh toan)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky tang xa hoi. ((hieu v) OR (hieu ve)) pham duc ban ((thanh hai) or (thanh toan)) cua tre*.