Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
cua tre » cua te, cuu tre, cua triet
duc ban » duc tan, duc van, dua ban
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
ve cac » va cac, vien cac
su sac » 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) or (su sach)) ky tang ma hoi. hieu ((va cam) or (ve cac)) duc ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su sach)) ky tang ma hoi. hieu ((va cam) OR (ve cac)) duc ban thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su sach)) ky tang ma hoi. hieu ((va cam) or (ve cac)) duc ban thanh dai cua tre*.