Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
hieu van » hieu va, thien van, lieu va
su sach » vu sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
so sach » so sanh, bo sach, co sach
van cau » van dau, van hau, van chat
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa

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: ((su sach) OR (so sach)) ky lang xa hoi. hieu van cau ((luc va) OR (tuc va)) hanh dai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky lang xa hoi. hieu van cau ((luc va) or (tuc va)) hanh dai cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky lang xa hoi. hieu van cau ((luc va) or (tuc va)) hanh dai cua triet*.