Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu hien » bieu hien, dieu hien, chieu chien
dinh vai » dinh van, dinh vi, dinh va
hien cac » thien cac, vien cac, hieu cac
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
bao va » bao ve, tao va, ban va

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 (lang xa)) hoi. hieu hien cac ((bao va) OR (hang va)) dinh vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (lang xa)) hoi. hieu hien cac ((bao va) or (hang va)) dinh vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu hien cac ((bao va) or (hang va)) dinh vai cua triet*.