Perhaps you should try some spelling variations:
dung quan » dung quang, dung luan, luong quan
hieu soat » hieu suat, hieu hoat, hieu luat
trinh san » trinh han, trinh quan, trinh toan
san quang » van quang, dan quang, san quan
kiem soat » kiem toan
quan van » luan van, quan va, quan luan
van hieu » cao hieu
quang va » quang van, quan va, quang ma
va kiem » van kien
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 quan van hieu soat ) or ( trinh san quang va kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung quan van hieu soat ) OR ( trinh san quang va kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung quan van hieu soat ) or ( trinh san quang va kiem soat ))*.