Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
trang xa » trang va, trang ha, trong xa
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tang xa » tang ma, lang xa, tang ha
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
hieu v » hieu va, hieu ve, hieu 2
v pham » vi pham, d pham

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 ky ((tang xa) or (trang xa)) hoi. hieu v pham duc ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((tang xa) OR (trang xa)) hoi. hieu v pham duc ban thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((tang xa) or (trang xa)) hoi. hieu v pham duc ban thanh dai cua tre*.