Perhaps you should try some spelling variations:
quang tan » quang tuan, quang tran, quang toan
kiem soat » kiem toan
danh nhan » doanh nhan, thanh nhan, benh nhan
hieu suat » hieu luat, hieu qua
van kiem » va kiem, van kien, van hieu
dan hieu » danh hieu, van hieu, dao hieu
tan van » tran van, tang van, luan van
nhan le » nhat le, phan le, nhan ve
le dan » ke dan
tinh » trinh, dinh, minh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh quang tan van kiem soat ) or ( danh nhan le dan hieu suat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang tan van kiem soat ) OR ( danh nhan le dan hieu suat ))*.