Perhaps you should try some spelling variations:
quang tuan » quang thanh, quan luan, quang cua
duong luan » dung luan, dong luan, duong quan
hieu soat » hieu suat, hieu hoat, hieu luat
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 duong luan van hieu soat ) or ( tinh ((quang uan) OR (quang tuan)) van kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( dinh duong luan van hieu soat ) OR ( tinh ((quang uan) OR (quang tuan)) van kiem soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( dinh duong luan van hieu soat ) or ( tinh ((quang uan) OR (quang tuan)) van kiem soat ))".
• Adding a wildcard symbol may retrieve word variants: (( dinh duong luan van hieu soat ) or ( tinh ((quang uan) OR (quang tuan)) van kiem soat ))*.