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
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
van cau » van dau, van hau, van chat
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tuc va » thuc va, tuc xa, duc va
luc va » duc va, loc 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: su sach ky lang xa hoi. hieu van cau ((luc va) OR (((tuc va) OR (truc va)))) hanh dai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. hieu van cau ((luc va) or (((tuc va) OR (truc va)))) hanh dai cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu van cau ((luc va) or (((tuc va) OR (truc va)))) hanh dai cua triet*.