Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
danh con » danh co, dang cong, danh ngon
mang xa » lang xa, mang may, dang xay
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
cac duc » cac du, cao duc, cac dac
va danh » va dinh, va dan, va hanh
con cua » cong cua, co cua, dong cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((mang xa) or (nang ma)) hoi. ((hieu va) or (lieu va)) cac duc va danh con cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((mang xa) OR (nang ma)) hoi. ((hieu va) OR (lieu va)) cac duc va danh con cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((mang xa) or (nang ma)) hoi. ((hieu va) or (lieu va)) cac duc va danh con cua tre*.