Perhaps you should try some spelling variations:
dung quang » dang quang, luong quang, dung luan
tinh luong » tinh huong, dinh luong, minh luong
luong quan » thong quan, duong qua
dung quan » dung luan, dang quang, dung cua
tran hieu » tran hien, tran hiep, trung hieu
hieu luat » hieu qua
kiem soat » kiem toan
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 quang) OR (dung quan)) tran hieu luat ) or ( tinh luong quan va kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh ((dung quang) OR (dung quan)) tran hieu luat ) OR ( tinh luong quan va kiem soat ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh ((dung quang) OR (dung quan)) tran hieu luat ) or ( tinh luong quan va kiem soat ))*".