Perhaps you should try some spelling variations:
dung quan » dung quang, dung luan, luong quan
hieu suat » hieu luat, hieu qua
nang quan » ban quan, nang suat
quan thai » quang thai, quan tai, quan hai
thai diem » hai diem, thoi diem, thai dien
diem soan » kiem toan, kiem soat, bien soan
quan cau » quang cao, toan cau, quan ha
cau hieu » cao hieu, cau dieu, cau hien
tin nang » tin dung, ki nang, thi nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh dung quan cau hieu suat ) or ( tin nang quan thai diem soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung quan cau hieu suat ) OR ( tin nang quan thai diem soan )).
• Adding a wildcard symbol may retrieve word variants: (( trinh dung quan cau hieu suat ) or ( tin nang quan thai diem soan ))*.