Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
bac tac » cac tac, bac thay
vai cua » dai cua, hai cua, lai cua
bac tai » bac dai, ban tai, cac tai
nang xa » nang x, lang xa, nang ma
da nang » cam nang, kha nang, cao nang
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) da nang xa hoi. hieu van ((bac tac) OR (bac tai)) ban thanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) da nang xa hoi. hieu van ((bac tac) OR (bac tai)) ban thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) da nang xa hoi. hieu van ((bac tac) OR (bac tai)) ban thanh vai cua tre*.