Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh lai » thanh hai, thanh lap, thanh loi
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, mang xa, ang xa
nang ma » tang ma, sang ma, nang cao
nam dua » nam da, nam cua, nam mua
dua ban » dia ban, cua ban, qua ban
lai cua » dai cua, hai cua, lai chau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((((nang xa) OR (nang ma))) OR (nang x)) hoi. hieu van nam dua ban thanh lai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((((nang xa) OR (nang ma))) or (nang x)) hoi. hieu van nam dua ban thanh lai cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((((nang xa) OR (nang ma))) or (nang x)) hoi. hieu van nam dua ban thanh lai cua viet*.