Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
vai cua » dai cua, hai cua, lai cua
cua chu » sua chua
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho
o hoc » co hoc, mo hoc, so hoc

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

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