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
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
dao duc » giao duc, tao duoc
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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 ve ((dao duc) or (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 ve ((dao duc) OR (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 ve ((dao duc) or (pham duc)) ban ((thanh hai) or (thanh toan)) cua tre*.