Perhaps you should try some spelling variations:
thien van » thi van
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
hieu van » hieu va, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
lam dua » lam cua, lam duoc, lam dung
dua ban » dia ban, cua ban, qua ban
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, 5 hoi

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) or (x ho)). ((hieu van) or (thien van)) lam dua ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (x ho)). ((hieu van) OR (thien van)) lam dua ban thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) or (x ho)). ((hieu van) or (thien van)) lam dua ban thanh tai cua tre*.