Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
nam duoc » nam thuoc, da duoc, dat duoc
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sach ky » sac ky, sach y, sach ty
lam duc » lam duoc, pham duc, lam dung
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky lang xa hoi. hieu van ((lam duc) or (nam duoc)) ban thanh van ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu van ((lam duc) OR (nam duoc)) ban thanh van ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. hieu van ((lam duc) or (nam duoc)) ban thanh van ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu van ((lam duc) or (nam duoc)) ban thanh van ((cua tre) OR (cuu tre))*.