Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
tang van » dang van, hoang van, trong van
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
van hoi » van hoa, van hoc, van hoe
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
ky tang » ky nang, ky dang, kho tang
tu sach » thu sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
du va » dau va, tu va, su va

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) or (toc sach))) or (tu sach)) ky tang van hoi. hieu ve cac du va thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((su sach) OR (toc sach))) OR (tu sach)) ky tang van hoi. hieu ve cac du va thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((su sach) or (toc sach))) or (tu sach)) ky tang van hoi. hieu ve cac du va thanh dai cua tre*.