Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hanh vii » hanh voi, hanh va, hanh noi
bach xuc » bach tuoc, bach xuan, bach hue
cuu tre » cua tre, cau tren, cau treo
lai roi » lai hoi, loi roi
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
sai ky » sac ky
xuc va » duc va, tuc va, luc va
tu sai » tu bai, tu san, tu cai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky tang ((mai hoi) or (lai roi)). hieu vien bach xuc va ((hanh vii) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky tang ((mai hoi) OR (lai roi)). hieu vien bach xuc va ((hanh vii) OR (hanh vi)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sai ky tang ((mai hoi) or (lai roi)). hieu vien bach xuc va ((hanh vii) or (hanh vi)) cuu tre*.