Perhaps you should try some spelling variations:
dong bang » dong san
canh tac » canh tay, canh giac, cong tac
danh cao » doanh cao, danh cho, danh ca
vien nam » vien dai, van nam, vien da
danh cac » dinh cac, danh ca, hanh cac
van hanh » van thanh, ban hanh, van anh
hien nay » hien dai
hoc vien » hoc hien, hoc viet, hoc tieng
dong bac » dong luc, dong hoc, dong ha
oc viet » hoc viet, toc viet, doc viet
van ha » van hoa, van chat, van phan
tac va » tac da, tac xa, tuc va
hoc vi » hoc va, hoc viet
o vien » so vien, o viet, hoi vien

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( canh tac va ((hoc vien) or (hoc vi)) nam ) or ((( ((dong bac) or (dong bang)) ((van ha) OR (van hanh))oc viet nam ) or ((( danh cac ((van ha) OR (van hanh))o vien nam ) or ( danh cao ((van ha) OR (van hanh)) hien nay ))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( canh tac va ((hoc vien) OR (hoc vi)) nam ) OR ((( ((dong bac) OR (dong bang)) ((van ha) OR (van hanh))oc viet nam ) OR ((( danh cac ((van ha) OR (van hanh))o vien nam ) OR ( danh cao ((van ha) OR (van hanh)) hien nay )))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( canh tac va ((hoc vien) or (hoc vi)) nam ) or ((( ((dong bac) or (dong bang)) ((van ha) OR (van hanh))oc viet nam ) or ((( danh cac ((van ha) OR (van hanh))o vien nam ) or ( danh cao ((van ha) OR (van hanh)) hien nay ))))))".
• Adding a wildcard symbol may retrieve word variants: (( canh tac va ((hoc vien) or (hoc vi)) nam ) or ((( ((dong bac) or (dong bang)) ((van ha) OR (van hanh))oc viet nam ) or ((( danh cac ((van ha) OR (van hanh))o vien nam ) or ( danh cao ((van ha) OR (van hanh)) hien nay ))))))*.