Perhaps you should try some spelling variations:
thien van » thi van
ban thanh » ban hanh, ban hang
thanh tri » thanh tra, thanh tai, chinh tri
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, lieu va, hieu ve
tu sach » su sach, te sach, tu cach
lam duc » lam duoc, pham duc, nam duoc
duc ban » duc tan, duc van, dua ban
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) OR (thu sach)) y nang x hoi. ((hieu van) or (thien van)) lam duc ban thanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang x hoi. ((hieu van) OR (thien van)) lam duc ban thanh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang x hoi. ((hieu van) or (thien van)) lam duc ban thanh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang x hoi. ((hieu van) or (thien van)) lam duc ban thanh tri cua tre*.