Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh tra » thanh toan, thanh hoa
thien van » thi van
tu sach » thu sach, su sach, te sach
lam duc » lam duoc, pham duc, nam duoc
cua tre » cuu tre, cua triet, dua tren
duc ban » duc tan, duc van, dua ban
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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