Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
hieu va » lieu va, hieu qua
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
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang ((mai hoi) or (ma hoa)). ((hieu ve) or (hieu va)) cau luc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((mai hoi) OR (ma hoa)). ((hieu ve) OR (hieu va)) cau luc va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((mai hoi) or (ma hoa)). ((hieu ve) or (hieu va)) cau luc va hanh vai cua tre*.