Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
va triet » va thiet, va trien, ve triet
te sach » toc sach
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
ve bac » ve bao, ve cac, ve ban
bo van » vo van, so van, do van
x hoi » xa hoi, o hoi, 5 hoi

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: te sach y nang ((x hoi) OR (x ho)). hieu ve bac bo van hanh vai ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((x hoi) or (x ho)). hieu ve bac bo van hanh vai ((cua triet) OR (va triet))~".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((x hoi) or (x ho)). hieu ve bac bo van hanh vai ((cua triet) OR (va triet))*.