Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
cam duc » cam xuc, pham duc, nam duoc
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cao duc » dao duc, cao suc, giao duc
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cua cu » cua chu, cua cau, cua su
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 hoi)). hieu ve ((cam duc) OR (cao duc)) va hanh vai cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (o hoi)). hieu ve ((cam duc) OR (cao duc)) va hanh vai cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((x hoi) or (o hoi)). hieu ve ((cam duc) OR (cao duc)) va hanh vai cua cu".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((x hoi) or (o hoi)). hieu ve ((cam duc) OR (cao duc)) va hanh vai cua cu*.