Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
kiem soat » kiem toan
tinh quan » tinh quang, trinh quan, tin quan
quan doan » quan hoang, chuan doan, quan doi
dieu soat » hieu suat, dieu hoa, dieu hat
dung lan » dung luan, dung land, dung lam
van kiem » va kiem, van kien, van hieu
lan van » luan van, lang van, tan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh dung lan van kiem soat ) or ( tinh quan ((quan doan) or (chan doan)) dieu soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung lan van kiem soat ) OR ( tinh quan ((quan doan) OR (chan doan)) dieu soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung lan van kiem soat ) or ( tinh quan ((quan doan) or (chan doan)) dieu soat ))*.