Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
tu sach » thu sach, te sach, tu cach
danh vi » hanh vi, dinh vi, danh di
xa danh » va danh, dia danh, nam danh
dai tuc » dai thuc, dai truc, dao tuc
luy tre » luyen tre
su sach » so sach, vu sach
vi luy » vi lua, vi luu
x hoi » xa hoi, o hoi, x ho
o hoc » co hoc, mo hoc, so hoc

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) or (su sach)) ky nang ((x hoi) or (o hoc)). hieu vien dai tuc xa danh vi luy tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ((x hoi) OR (o hoc)). hieu vien dai tuc xa danh vi luy tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang ((x hoi) or (o hoc)). hieu vien dai tuc xa danh vi luy tre*.