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