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

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