Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
thu sach » tu sach, thuat sach, thuoc sach
thai tuc » thai thuc, thai thuy, thai hoc
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va thai » van thai, va tai, va tham
tuc van » thuc van, truc van, tuc 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: thu sach ky ((nang xa) OR (hang va)) hoi. lieu va thai tuc van hanh vi ((cua triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) or (hang va)) hoi. lieu va thai tuc van hanh vi ((cua triet) OR (su triet))~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (hang va)) hoi. lieu va thai tuc van hanh vi ((cua triet) OR (su triet))*.