Perhaps you should try some spelling variations:
thien van » thi van
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
lam duoc » nam duoc, luat duoc, lam thuoc
hieu van » hieu va, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
lam duc » pham duc, nam duoc, lam dung
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang x hoi. ((hieu van) or (thien van)) ((lam duc) OR (lam duoc)) ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. ((hieu van) OR (thien van)) ((lam duc) OR (lam duoc)) ban thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. ((hieu van) or (thien van)) ((lam duc) OR (lam duoc)) ban thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((hieu van) or (thien van)) ((lam duc) OR (lam duoc)) ban thanh tai cua tre*.