Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
duc van » duc va, duc tan, duc manh
hanh va » hang va, hanh vi
y nang » ky nang, ly nang, v nang
ve cao » va cao, ve bao, ve cac
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y nang x hoi. hieu ve cao duc van hanh va ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y nang x hoi. hieu ve cao duc van hanh va ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: hoc sach y nang x hoi. hieu ve cao duc van hanh va ((cua triet) or (cua viet))*.