Perhaps you should try some spelling variations:
quang tuan » quang thanh, quan luan, quang cua
dinh dong » dinh duong, dinh hong, dinh dung
dong luan » dung luan, tong luan, dong xuan
hieu suat » hieu luat, hieu qua
quang uan » quang ban, quang tran, quang chan
kiem soat » kiem toan
van hieu » cao hieu
van kiem » va kiem, van kien, van hien

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

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