Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
va doanh » vay doanh, va danh, hoa doanh
su sach » so sach, vu sach
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
so sanh » do sanh
va cua » va chua, via cua, ca cua
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: ((su sach) or (so sanh)) ky dang xa hoi. lieu va cau luc ((va doanh) OR (van doanh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ky dang xa hoi. lieu va cau luc ((va doanh) OR (van doanh)) va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) ky dang xa hoi. lieu va cau luc ((va doanh) OR (van doanh)) va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) ky dang xa hoi. lieu va cau luc ((va doanh) OR (van doanh)) va cua tre*.