Perhaps you should try some spelling variations:
phien nay » hien nay, phien nam, phien ban
hoc phien » thuoc phien, hoc nghien, hoc phan
canh cac » canh giac, canh chau, canh chuc
hanh cac » hang cac, hanh cat, nhanh cay
hien nam » phien nam, hien nay, vien nam
canh tac » canh tay, canh giac, cong tac
tac vang » cac van, tac dung, tac dong
vang hoc » van hoc, nang hoc, vung hoc
dan hoc » van hoc, dan toc, toan hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((( ((canh cac) OR (hanh cac)) dan hoc hien nam ) or ( ((canh cac) OR (hanh cac)) dai hoc hien nam ))) or ((( canh tac vang hoc hien nam ) or ( canh tac vang hoc phien nay ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( ((canh cac) OR (hanh cac)) dan hoc hien nam ) OR ( ((canh cac) OR (hanh cac)) dai hoc hien nam ))) OR ((( canh tac vang hoc hien nam ) OR ( canh tac vang hoc phien nay )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( ((canh cac) OR (hanh cac)) dan hoc hien nam ) or ( ((canh cac) OR (hanh cac)) dai hoc hien nam ))) or ((( canh tac vang hoc hien nam ) or ( canh tac vang hoc phien nay ))))".
• Adding a wildcard symbol may retrieve word variants: (((( ((canh cac) OR (hanh cac)) dan hoc hien nam ) or ( ((canh cac) OR (hanh cac)) dai hoc hien nam ))) or ((( canh tac vang hoc hien nam ) or ( canh tac vang hoc phien nay ))))*.