Perhaps you should try some spelling variations:
phuong quang » phung quang, thuong quang, phuong hoang
dung phuong » dung thuong, bang phuong, dung chung
quang kien » quang dien, quang lien, quang tien
dung quan » dung quang, luong quan, dang quang
hieu soat » hieu suat, hieu hoat, hieu luat
kien soan » bien soan, kiem toan, kiem soat
van hieu » cao hieu
luan » lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh ((dung quan) OR (dung luan)) van hieu soat ) or ( trinh dung phuong quang kien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh ((dung quan) OR (dung luan)) van hieu soat ) OR ( trinh dung phuong quang kien soan )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh ((dung quan) OR (dung luan)) van hieu soat ) or ( trinh dung phuong quang kien soan ))".
• Adding a wildcard symbol may retrieve word variants: (( tinh ((dung quan) OR (dung luan)) van hieu soat ) or ( trinh dung phuong quang kien soan ))*.