Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
kho tang » cao tang
su sach » so sach, vu sach
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
xuc ban » cuc ban, quoc ban, xuat ban
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
su sac » su cac, su xac
ve cam » ve cham, ve cac, va cam

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)) kho tang xa hoi. hieu ve cam ((xuc ban) or (duc ban)) thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su sach)) kho tang xa hoi. hieu ve cam ((xuc ban) OR (duc ban)) thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su sach)) kho tang xa hoi. hieu ve cam ((xuc ban) or (duc ban)) thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sac) OR (su sach)) kho tang xa hoi. hieu ve cam ((xuc ban) or (duc ban)) thanh dai cua tre*.