Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
doanh vai » doanh tai, doanh va, doanh van
viec cac » vien cac, viec lam, viec va
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
lo van » le van, vo van, so 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 ty xang xa hoi. hieu ((viec cac) or (viec cua)) lo van doanh vai ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang xa hoi. hieu ((viec cac) OR (viec cua)) lo van doanh vai ((cuu tre) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty xang xa hoi. hieu ((viec cac) or (viec cua)) lo van doanh vai ((cuu tre) OR (cua tre))*".