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