Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va thiet, va trien, ve triet
su sach » vu sach
so sach » so sanh, bo sach, co sach
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
dai tuc » dai thuc, dai truc, dao tuc
tuc van » thuc van, truc van, tuc va
dai va » mai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) ky dang xa hoi. hieu vien dai tuc van hanh dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky dang xa hoi. hieu vien dai tuc van hanh dai va triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky dang xa hoi. hieu vien dai tuc van hanh dai va triet*.