Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
so sach » so sanh, bo sach, co sach
sang ma » tang ma, sang tao, mang may
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, nang cao, mang may
vu sach » vu bach, su sach, vu khach
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (vu sach)) ky ((nang ma) OR (sang ma)) hoi. hieu va cam xuc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (vu sach)) ky ((nang ma) OR (sang ma)) hoi. hieu va cam xuc va hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (vu sach)) ky ((nang ma) OR (sang ma)) hoi. hieu va cam xuc va hanh vai cua tre*".