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, tinh sang
tich nang » tich van, tin nang
hien soat » thien hoat, kiem soat, bien soan
tang van » dang van, hoang van, trong van
van hieu » cao hieu
quan va » quan vi, quan ha, luan va
va hien » van hien, va lien, va dien

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) or (tich nang)) quan va hien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung tang van hieu luat ) OR ( ((tinh nang) OR (tich nang)) quan va hien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung tang van hieu luat ) or ( ((tinh nang) or (tich nang)) quan va hien soat ))*.