Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
su sach » so sach
vai cua » dai cua, hai cua, lai cua
vu sach » vu bach, vu khach
da voi » dao voi, dua voi, ba voi
dat vo » dat va, dat o, dat ve
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 (vu sach)) ky nang x hoi. hieu vien ((da voi) or (dat vo)) van hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang x hoi. hieu vien ((da voi) OR (dat vo)) van hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang x hoi. hieu vien ((da voi) or (dat vo)) van hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky nang x hoi. hieu vien ((da voi) or (dat vo)) van hanh vai cua te*.