Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van nang » van quang, van dong, van dung
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
hanh ve » hanh vi, hanh va, hanh kem
cua tre » cua te, cuu tre, dua tren
ve cau » ke cau, va cau, ve cac

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) OR (van ban)) xa hoi. hieu ve 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) OR (van ban)) xa hoi. hieu ve cau truc van hanh ve ((cua tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: so sach ((van nang) OR (van ban)) xa hoi. hieu ve cau truc van hanh ve ((cua tre) or (cua triet))*.