Perhaps you should try some spelling variations:
nang quan » ban quan, nang suat
tinh nang » trinh nang, tin nang, tich nang
bien soan » bien so
kiem soat » kiem toan
dung dat » dung va, dung tai
van hieu » cao hieu
quan van » luan van, quan va, quan luan
dat van » dao van, dat va, dam van

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 dat van hieu qua ) or ( tinh nang quan van ((bien soan) or (kiem soat)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung dat van hieu qua ) OR ( tinh nang quan van ((bien soan) OR (kiem soat)) )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung dat van hieu qua ) or ( tinh nang quan van ((bien soan) or (kiem soat)) ))*.