Perhaps you should try some spelling variations:
thuong quan » thuong quang, truong quan, tuong quan
minh thong » minh thuong, minh tuong, minh thang
thong dung » thong cong, thong thuong
hieu soat » hieu suat, hieu hoat, hieu luat
kiem soat » kiem toan
dung van » duong van, dung va, dang van
van hieu » cao hieu
va kiem » van kien

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: (( minh thong dung van hieu soat ) OR ( trinh ((thuong quan) OR (thong quan)) va kiem soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( minh thong dung van hieu soat ) or ( trinh ((thuong quan) OR (thong quan)) va kiem soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( minh thong dung van hieu soat ) or ( trinh ((thuong quan) OR (thong quan)) va kiem soat ))*.