Perhaps you should try some spelling variations:
tinh dung » tin dung, tinh quang, tinh huong
hieu soat » hieu suat, hieu hoat, hieu luat
dung quan » dung quang, dung luan, luong quan
kiem soat » kiem toan
luan tim » luan tieu, luan tinh, luan gia
luan thi » luan chi, luan thiet, luyen thi
quan va » quan vi, quan ha, luan va
va kiem » van kien

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 ((luan tim) OR (luan thi)) hieu soat ) or ( trinh dung quan va kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung ((luan tim) OR (luan thi)) hieu soat ) OR ( trinh dung quan va kiem soat ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung ((luan tim) OR (luan thi)) hieu soat ) or ( trinh dung quan va kiem soat ))*".