Perhaps you should try some spelling variations:
quang luan » quan luan, quang tuan, quang uan
luong quan » thong quan, duong qua
dung quan » dung quang, dung luan, dang quang
hieu luat » hieu qua
kiem soat » kiem toan
van hieu » cao hieu
luan va » luan van, luat va
va kiem » van kien

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: (( trinh ((dung quan) OR (luong quan)) van hieu luat ) OR ( tinh quang luan va kiem soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( trinh ((dung quan) OR (luong quan)) van hieu luat ) or ( tinh quang luan va kiem soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( trinh ((dung quan) OR (luong quan)) van hieu luat ) or ( tinh quang luan va kiem soat ))*.