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
bach so » mach so, bach hoa, bach mao
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
y nang » ky nang, ly nang, v nang
so van » su van, vo van
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 y nang x hoi. hieu vien bach so van danh ((vai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu vien bach so van danh ((vai cua) OR (hai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu vien bach so van danh ((vai cua) or (hai cua)) tre*.