Perhaps you should try some spelling variations:
hanh vai » hanh va, hanh tai, hanh van
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, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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