Perhaps you should try some spelling variations:
dung tang » dung thang, dung trang, dung dang
hieu luat » hieu qua
tinh nang » trinh nang, tin nang, tich nang
nang luan » tang luan, hang luan, nang quan
hien soat » thien hoat, kiem soat, bien soan
tang van » dang van, hoang van, trong van
van hieu » cao hieu
van hien » van tien

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin dung tang van hieu luat ) OR ( tinh nang luan van hien soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tin dung tang van hieu luat ) OR ( tinh nang luan van hien soat ))".
• Adding a wildcard symbol may retrieve word variants: (( tin dung tang van hieu luat ) OR ( tinh nang luan van hien soat ))*.