Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
viet cac » viet ca, viet bac, viet cau
van danh » van doanh, van anh, van hanh
vai cau » van cau, vai cac, lai chau
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
co van » cao van, vo van, so van
va cau » van cau, va cac, va dau

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. sieu ((viet cac) or (vien cac)) co van danh ((vai cau) OR (va cau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. sieu ((viet cac) OR (vien cac)) co van danh ((vai cau) OR (va cau)) treo*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. sieu ((viet cac) or (vien cac)) co van danh ((vai cau) OR (va cau)) treo*".