Perhaps you should try some spelling variations:
quang luan » quan luan, quang tuan, quang uan
hieu soat » hieu suat, hieu hoat, kiem soat
danh nhan » doanh nhan, thanh nhan, benh nhan
gian hieu » gian viet, tin hieu, gian dien
hieu luat » hieu qua
van hieu » cao hieu
nhan va » nhan tai, nhan dan, nhan tao
va gian » va gianh, van gian, va giai
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 luan van hieu soat ) or ( danh nhan va gian hieu luat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang luan van hieu soat ) OR ( danh nhan va gian hieu luat ))*.