Perhaps you should try some spelling variations:
dung quang » dang quang, dung quan, luong quang
trinh hang » trinh han, tranh hang, trinh hanh
quang cao » nang cao, quang nam
hieu soat » hieu suat, hieu hoat, hieu luat
hang luan » tang luan, dung luan
kiem soat » kiem toan
van kiem » va kiem, van kien, van hieu
tin » tinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin dung quang cao hieu soat ) or ( trinh hang luan van kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung quang cao hieu soat ) OR ( trinh hang luan van kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung quang cao hieu soat ) or ( trinh hang luan van kiem soat ))*.