Perhaps you should try some spelling variations:
khong luan » thong luan, khong quan, khung luan
tinh khong » tinh khang, tinh huong, benh khong
hieu luat » hieu qua
hieu suat » hieu qua
tinh qua » tinh quan, trinh qua, tinh cua
van hieu » cao hieu
quan vi » quan li, quan tri, quan doi
vi hieu » vi dieu, va hieu, vo hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh qua quan vi hieu luat ) or ( tinh khong luan van hieu suat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh qua quan vi hieu luat ) OR ( tinh khong luan van hieu suat ))*.