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
tinh dung » tin dung, tinh quang, tinh huong
dung quan » dung quang, dung luan, luong quan
hieu soat » hieu hoat, hieu luat, kiem soat
hieu suat » hieu luat, hieu qua
kien soan » bien soan, kiem toan, kiem soat
quan van » luan van, quan va, quan luan

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