Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
so sach » so sanh, bo sach, co sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua

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 y nang mai hoi. ((hieu ve) or (hieu va)) cam xuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang mai hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach y nang mai hoi. ((hieu ve) or (hieu va)) cam xuc va hanh vi cua tre*.