Perhaps you should try some spelling variations:
phuong quang » thuong quang, phuong hoang, luong quang
phung quang » hung quang, thuong quang, dung quang
quang tran » quang tuan, quang trung, quang thanh
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
tran van » luan 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: (( trinh ((phuong quang) OR (phung quang)) va hieu suat ) or ( tinh quang tran van kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh ((phuong quang) OR (phung quang)) va hieu suat ) OR ( tinh quang tran van kiem soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( trinh ((phuong quang) OR (phung quang)) va hieu suat ) or ( tinh quang tran van kiem soat ))".
• Adding a wildcard symbol may retrieve word variants: (( trinh ((phuong quang) OR (phung quang)) va hieu suat ) or ( tinh quang tran van kiem soat ))*.