Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
dai hoi » dai hoc, dai hai, dai moi
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
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 ty nang dai 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 ty nang dai hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty nang dai hoi. ((hieu ve) or (hieu va)) cam xuc va hanh vi cua tre*.