Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
vien cac » vien bach, vien dai, vien da
tu sach » thu sach, su sach, te sach
luc van » luoc van, luu van, duc van
cac luc » cau luc, coc luc, cac nuoc
lai roi » lai hoi, loi roi
mai hoi » mai khoi, dai hoi, lai hoi
va nang » van nang, da nang, cam nang
cua duc » cua tuc, cua nuoc, cua quoc
y nang » ky nang, ly nang, v nang
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: tu sach ((y nang) or (va nang)) ((mai hoi) or (lai roi)). hieu vien cac luc van thanh vi cua duc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (va nang)) ((mai hoi) OR (lai roi)). hieu vien cac luc van thanh vi cua duc.
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (va nang)) ((mai hoi) or (lai roi)). hieu vien cac luc van thanh vi cua duc*.