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
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cua triet, dua tren
lam dua » lam cua, lam duoc, lam dung
hieu va » lieu va, hieu qua
cuu tre » cau tren, cau treo
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 va) or (thien van)) lam dua ban thanh tra ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. ((hieu va) OR (thien van)) lam dua ban thanh tra ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. ((hieu va) or (thien van)) lam dua ban thanh tra ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((hieu va) or (thien van)) lam dua ban thanh tra ((cua tre) OR (cuu tre))*.