Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
tu sach » thu sach, su sach, te sach
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
ha hoi » hoa hoi, ha noi, va hoi
cac lo » cac lop, cac co, cac bo
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 ((ky lang) OR (ky dang)) ((ha hoi) or (xa hoi)). hieu viec cac lo van doanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky dang)) ((ha hoi) OR (xa hoi)). hieu viec cac lo van doanh tai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) OR (ky dang)) ((ha hoi) or (xa hoi)). hieu viec cac lo van doanh tai cuu tre*".