Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
dat vo » dat va, dat o, dat ve
cua te » cua tu
da vo » da voi, va vo, da co

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 y nang xa hoi. hieu vien ((da vo) or (dat vo)) van hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu vien ((da vo) OR (dat vo)) van hanh vai cua te.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu vien ((da vo) or (dat vo)) van hanh vai cua te*.