Perhaps you should try some spelling variations:
dung quang » dang quang, dung quan, luong quang
tinh dung » trinh dung, tin dung, tinh quang
hieu luat » hieu qua
nang quan » ban quan, nang suat
hien soat » thien hoat, kiem soat, bien soan
van hieu » cao hieu
van hien » van tien
luan » lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh dung luan van hieu luat ) or ( binh ((nang quan) or (dung quang)) van hien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu luat ) OR ( binh ((nang quan) OR (dung quang)) van hien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu luat ) or ( binh ((nang quan) or (dung quang)) van hien soat ))*.