Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
hieu viec » nhieu viec, hieu ve, sieu viet
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cac bo » bac bo, cac co
cac lo » cac lop, cac co, cac 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 ky lang xa hoi. hieu viec ((cac lo) or (cac bo)) van doanh ((vai cuu) OR (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu viec ((cac lo) OR (cac bo)) van doanh ((vai cuu) OR (vai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. hieu viec ((cac lo) or (cac bo)) van doanh ((vai cuu) OR (vai cua)) tre*".