Perhaps you should try some spelling variations:
thien van » thi van
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
thuc ban » thuoc ban, thuc dan, thu ban
bac thuc » bao thuc, bac thua, cach thuc
vai cua » dai cua, hai cua, lai cua
van bac » van ban, van bao, van hac
cua tre » cua te, cuu tre, cua triet
ky lang » ky dang, ky tang, tay lang
su sach » so sach, vu sach
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 lang) or (ky nang)) xa hoi. thien van bac thuc ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su sach)) ((ky lang) OR (ky nang)) xa hoi. thien van bac thuc ban thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su sach)) ((ky lang) or (ky nang)) xa hoi. thien van bac thuc ban thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sac) OR (su sach)) ((ky lang) or (ky nang)) xa hoi. thien van bac thuc ban thanh vai cua tre*.