Perhaps you should try some spelling variations:
thanh loi » thanh hoa, thanh hai, thanh lap
thanh lai » thanh hai, thanh lap, thanh tai
van cham » van chat, van tham, va cham
cham duc » pham duc, cham soc, pham duy
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, ma hoa, me hoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky sang ((ma hoi) OR (xa hoi)). hieu van cham duc ban ((thanh lai) OR (thanh loi)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky sang ((ma hoi) OR (xa hoi)). hieu van cham duc ban ((thanh lai) or (thanh loi)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky sang ((ma hoi) OR (xa hoi)). hieu van cham duc ban ((thanh lai) or (thanh loi)) cua tre*.