Perhaps you should try some spelling variations:
hoc phien » hoc hien, thuoc phien, hoc nghien
phien nam » hien nay, vien nam, mien nam
canh cac » hanh cac, canh giac, canh chau
phan ban » phan banh, phan van, phan ba
hoc phan » hoc dan, hoc pho
vung hoc » dung hoc, vung moc, trung hoc
tac vung » tac dung, tac vang, tay vung
hien nam » hien nay, vien nam, mien nam
canh tac » canh tay, canh giac, cong tac
cac van » cac dan
van hoc » van hoa
tac va » tac da, tuc va, tac ha
tac xa » tuc xa, tac da

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