Perhaps you should try some spelling variations:
thuoc phien » thuc hien, phuoc hien, thuat phien
nghien nam » nghiep nam, nguyen nam, nghe nam
hoc phien » hoc hien, hoc nghien, hoc phan
hanh cac » hang cac, hanh cat, nhanh cay
cac vung » cac ung, cac chung, cach dung
vien nam » viet nam, vien dai, van nam
hoc vien » hoc hien, hoc viet, hoc tieng
vung moc » dung mo, dung moi, dung mot
danh tac » canh tac, danh bac, doanh tai
dinh cac » tinh cach, dinh chuc, dinh chau
cac van » cac dan
van hoc » van hoa

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

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