Perhaps you should try some spelling variations:
dung nang » dun nang, dung dang, dung quang
hieu luat » hieu qua
trinh san » trinh han, trinh quan, trinh toan
hien soat » thien hoat, kiem soat, bien soan
nang van » dang van, tang van, lang van
van hieu » cao hieu
quan va » quan vi, quan ha, luan va
tin » tinh

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