Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh van, doanh nhan
danh tac » canh tac, danh bac, doanh tai
tac vang » cac van, tac dung, tac dong
vang hoc » van hoc, nang hoc, vung hoc
hien nam » phien nam, hien nay, mien nam
vien nam » viet nam, vien dai, van nam
ban van » ban dan, ban va, tan van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( danh tac vang hoc ((hien nam) OR (vien nam)) ) or ( doanh ban van hoa ((hien nam) OR (vien nam)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( danh tac vang hoc ((hien nam) OR (vien nam)) ) OR ( doanh ban van hoa ((hien nam) OR (vien nam)) ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( danh tac vang hoc ((hien nam) OR (vien nam)) ) or ( doanh ban van hoa ((hien nam) OR (vien nam)) ))*".