Perhaps you should try some spelling variations:
phien nam » hien nay, phien ban, vien nam
danh bach » danh bac, danh bat, dan bac
canh tac » canh tay, canh giac, cong tac
vang hoc » nang hoc, vung hoc, bang hoc
dong hoc » dong co, dong luc
hien nam » hien nay, vien nam, mien nam
bach van » bach dan, cach van, bach dang
van hoc » van hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((doanh tai) OR (canh tac)) ((((vang hoc) OR (nang luc))) OR (dong hoc)) ((hien nam) OR (phien nam)) ) OR ( danh bach van hoc ((hien nam) OR (phien nam)) ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((doanh tai) or (canh tac)) ((((vang hoc) or (nang luc))) or (dong hoc)) ((hien nam) OR (phien nam)) ) or ( danh bach van hoc ((hien nam) OR (phien nam)) ))~".
• Adding a wildcard symbol may retrieve word variants: (( ((doanh tai) or (canh tac)) ((((vang hoc) or (nang luc))) or (dong hoc)) ((hien nam) OR (phien nam)) ) or ( danh bach van hoc ((hien nam) OR (phien nam)) ))*.