Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
doanh vai » doanh tai, doanh va, doanh van
cau tren » cu tren, dau tren, ca tren
vien cac » vien bach, vien dai, vien da
viec lam » viec va
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
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 cac) or (viec lam)) so van doanh vai ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((vien cac) OR (viec lam)) so van doanh vai ((cuu tre) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((vien cac) or (viec lam)) so van doanh vai ((cuu tre) OR (cau tren))*".