Perhaps you should try some spelling variations:
phuong quang » phung quang, thuong quang, phuong hoang
tinh phuong » trinh phuong, tinh huong, dinh phuong
quang tuan » quang thanh, quan luan, quang cua
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
quang va » quang van, quan va, quang ma
tuan van » luan van, tran van, tan van
van kiem » va kiem, van kien, van hieu
va hieu » van hieu, va dieu, va hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh phuong quang va hieu suat ) or ( tinh quang tuan van kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh phuong quang va hieu suat ) OR ( tinh quang tuan van kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh phuong quang va hieu suat ) or ( tinh quang tuan van kiem soat ))*.