Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
cam luc » cam xuc
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
lai hoi » lai hoa, lai roi, mai hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((lai hoi) OR (dai hoi)). hieu ve ((cam luc) or (cau luc)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((lai hoi) OR (dai hoi)). hieu ve ((cam luc) OR (cau luc)) va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((lai hoi) OR (dai hoi)). hieu ve ((cam luc) or (cau luc)) va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((lai hoi) OR (dai hoi)). hieu ve ((cam luc) or (cau luc)) va hanh vai cua tre*.