Perhaps you should try some spelling variations:
quang tuan » quang thanh, quan luan, quang cua
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
dung lan » dung luan, dung land, dung lam
van hieu » cao hieu
lan van » luan van, lang van, tan van
tuan va » toan va, luan va, quan va
tra » tran

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 lan van hieu suat ) or ( tinh quang tuan va ((kiem soat) or (kiem tra)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung lan van hieu suat ) OR ( tinh quang tuan va ((kiem soat) OR (kiem tra)) )).
• Adding a wildcard symbol may retrieve word variants: (( trinh dung lan van hieu suat ) or ( tinh quang tuan va ((kiem soat) or (kiem tra)) ))*.