Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van danh » van doanh, van anh, van manh
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cac lo » cac lop, cac co, cac bo
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: tu sach ky nang x hoi. hieu vien cac lo ((van danh) or (van hanh)) ((vai cuu) OR (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu vien cac lo ((van danh) OR (van hanh)) ((vai cuu) OR (vai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu vien cac lo ((van danh) or (van hanh)) ((vai cuu) OR (vai cua)) tre*".