Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh huong
hieu soat » hieu suat, hieu hoat, hieu luat
kiem soat » kiem toan
dung lan » dung luan, dung land, dung lam
van hieu » cao hieu
lan van » luan van, lang van, tan van
cua dan » cua dang, cua ban, ca dan

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