Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
hieu van » thien van, lieu va, hieu ve
va thanh » gia thanh, ban thanh, va tinh
thanh di » thanh doi, thanh de, thanh do
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
di cua » dai cua, doi cua, de 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 mai hoi. ((hieu va) or (hieu van)) cam xuc va thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang mai hoi. ((hieu va) OR (hieu van)) cam xuc va thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty nang mai hoi. ((hieu va) or (hieu van)) cam xuc va thanh di cua tre*.