Perhaps you should try some spelling variations:
quang luan » quan luan, quang tuan, quang uan
hieu soat » hieu hoat, hieu luat, kiem soat
danh phan » doanh phan, danh nhan, danh phap
hieu suat » hieu luat, hieu qua
van hieu » cao hieu
lan hieu » luan hieu, lan dieu, gian hieu
phan le » pham le, phan mem, phan lap
le lan » le lang, le luan, le 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 luan van hieu soat ) or ( danh phan le lan hieu suat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang luan van hieu soat ) OR ( danh phan le lan hieu suat ))*.