Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thien van » thi van
thanh tra » thanh toan, thanh hoa
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
lam dua » lam cua, lam duoc, lam dung
dua ban » dia ban, cua ban, qua ban
tra cua » trau cua, trua cua, tra cuu
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van 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 v nang x hoi. ((hieu va) or (thien van)) lam dua ban thanh tra cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang x hoi. ((hieu va) OR (thien van)) lam dua ban thanh tra cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach v nang x hoi. ((hieu va) or (thien van)) lam dua ban thanh tra cua tre*.