Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh do » thanh pho, thanh hoa, thanh loi
thanh de » hanh de, thanh ve, thanh le
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
van dau » van dao, phan dau
mang xa » lang xa, mang may, dang xay

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: thu sach ky ((mang xa) OR (nang ma)) hoi. hieu van dau tu va ((thanh de) OR (thanh do)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((mang xa) or (nang ma)) hoi. hieu van dau tu va ((thanh de) OR (thanh do)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((mang xa) or (nang ma)) hoi. hieu van dau tu va ((thanh de) OR (thanh do)) cua triet*.