Perhaps you should try some spelling variations:
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 » vien dai, van nam, hien nay
canh tay » canh tac, thanh tay
hoc viet » hoc hien
ban tay » ban tai, ban than, gian tay
anh ta » anh tu, anh va, anh tuan

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 ( ((anh ta) or (((canh tay) or (ban tay)))) vang hoc viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( danh tac vang hoc ((hien nam) OR (vien nam)) ) OR ( ((anh ta) OR (((canh tay) OR (ban tay)))) vang hoc viet nam )).
• Adding a wildcard symbol may retrieve word variants: (( danh tac vang hoc ((hien nam) or (vien nam)) ) or ( ((anh ta) or (((canh tay) or (ban tay)))) vang hoc viet nam ))*.