Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
dua ban » cua ban, qua ban, mua ban
duc ban » duc tan, duc van, duc man
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, ma hoa

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