Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
hanh di » hanh vi, hanh de, hang di
tu sach » thu sach, su sach, te sach
qua cam » qua cham, qua cac, qua ca
cam duc » cam xuc, cao duc, pham duc
x hoi » xa hoi, o hoi, x ho

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: ((tu sach) OR (hoc sach)) ky nang x hoi. hieu qua cam duc van hanh di ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (hoc sach)) ky nang x hoi. hieu qua cam duc van hanh di ((cua triet) OR (va triet))~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ky nang x hoi. hieu qua cam duc van hanh di ((cua triet) OR (va triet))*.