Perhaps you should try some spelling variations:
hoc phien » hoc hien, thuoc phien, hoc nghien
danh tac » danh bac, doanh tai, danh thuc
canh tac » canh tay, canh giac, cong tac
hanh cac » hang cac, hanh cat, nhanh cay
hien nam » phien nam, hien nay, mien nam
vien nam » viet nam, vien dai, van nam
vang hoc » nang hoc, vung hoc, bang hoc
quan hoc » quang hoc, luan hoc, quan doc
tac vang » tac dung, tac dong
cac van » cac dan
tac van » tac va, tac can, thuc van
van hoc » van hoa

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