Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dinh dat » dinh ket, dinh van, dinh lam
tu sach » thu sach, su sach, tu cach
cua tre » cua te, cua triet, dua tren
vu dinh » quy dinh
truc vu » truc du, truc va, truc cu
van cau » van dau, van hau, van chat
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
cuu tre » cau tren, cau treo

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 (te sach)) ky tang xa hoi. hieu van cau truc vu dinh dat ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky tang xa hoi. hieu van cau truc vu dinh dat ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky tang xa hoi. hieu van cau truc vu dinh dat ((cua tre) or (cuu tre))*.