Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cac toc » cac nuoc, cac thoi
cac toi » cac thoi
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky lang xa hoi. hieu vien ((cac toc) or (cac toi)) ban hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang xa hoi. hieu vien ((cac toc) OR (cac toi)) ban hanh di cua triet.
• Adding a wildcard symbol may retrieve word variants: so sach ky lang xa hoi. hieu vien ((cac toc) or (cac toi)) ban hanh di cua triet*.