Perhaps you should try some spelling variations:
danh tac » canh tac, danh bac, danh thuc
tac vung » tac dung, tac vang, tay vung
vung hoc » dung hoc, vung moc, trung hoc
tai nang » thi nang, tai lang, dai nang
luc viet » luoc viet, tuc viet, duc viet
ban vung » ben vung, dan vung, ban cung
hien nam » phien nam, hien nay, vien nam
ba vung » ba hung, va vung, ben vung

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