Perhaps you should try some spelling variations:
tinh dung » tinh quang, tinh huong, anh dung
quang uan » quang tuan, quang ban, quang tran
hieu soat » hieu suat, hieu hoat, hieu luat
dung quan » dung quang, dung luan, luong quan
kiem soat » kiem toan
uan hieu » luan hieu, van hieu, luan tieu
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) OR (tin dung)) quang uan hieu soat ) or ( trinh dung quan va kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tinh dung) OR (tin dung)) quang uan hieu soat ) OR ( trinh dung quan va kiem soat ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((tinh dung) OR (tin dung)) quang uan hieu soat ) or ( trinh dung quan va kiem soat ))*".