Perhaps you should try some spelling variations:
quang tuan » quang thanh, quang cua
tinh dung » trinh dung, tin dung, tinh quang
dung quan » dung quang, dung luan, luong quan
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
quan van » luan van, quan va, quan doan
van hieu » cao hieu
va kiem » van kien

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