Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van danh » van doanh, van anh, van hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
bach so » mach so, bach hoa, bach mao
vai cua » dai cua, bai cua, mai cua
lai cua » dai cua, lai chau, thai cua
hai cua » thai cua, dai cua, hoi cua
so van » su van, vo van

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 xa hoi. hieu vien bach so van danh ((((vai cua) OR (lai cua))) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu vien bach so van danh ((((vai cua) OR (lai cua))) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu vien bach so van danh ((((vai cua) OR (lai cua))) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu vien bach so van danh ((((vai cua) OR (lai cua))) or (hai cua)) tre*.