Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
bach hoa » bach khoa, bach ha, cach hoan
danh vai » danh sai, doanh van, dang van
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hoa van » hoa dan, hoang van, hoa phan
danh va » doanh va, hanh va, anh va

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 hoa van ((danh vai) or (danh va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu vien bach hoa van ((danh vai) OR (danh va)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu vien bach hoa van ((danh vai) or (danh va)) cau tren*.