Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach van » sach han, sach va, bach van
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
hieu van » hieu va, thien van, lieu va
van nang » van quang, van ban, van dong
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
hanh ve » hanh vi, hanh va, hanh kem
cua tre » cua te, cuu tre, dua tren
so sach » so sanh, bo sach, co sach

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: so sach van nang xa hoi. ((hieu ve) OR (hieu van)) cau truc van hanh ve ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach van nang xa hoi. ((hieu ve) OR (hieu van)) cau truc van hanh ve ((cua tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: so sach van nang xa hoi. ((hieu ve) OR (hieu van)) cau truc van hanh ve ((cua tre) or (cua triet))*.