Perhaps you should try some spelling variations:
trinh quan » trinh luat, trinh han
tinh dung » trinh dung, tin dung, tinh huong
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
van hieu » cao hieu
van kiem » va kiem, van kien, van hien
van van » van ban, tan van, san van
luan » lan

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

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