Perhaps you should try some spelling variations:
quang quan » quang tuan, quang uan, quan quan
kiem soat » kiem toan
dung lan » dung luan, dung land, dung lam
cho hieu » cao hieu, chi hieu, cho dieu
quan hoi » quang hoi, quan doi, quan hai
hoi kiem » hoan kiem, thoi diem, thi kiem
co hieu » cao hieu, doc hieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh dung lan ((cho hieu) OR (co hieu)) qua ) or ( tinh quang quan hoi kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung lan ((cho hieu) OR (co hieu)) qua ) OR ( tinh quang quan hoi kiem soat ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( trinh dung lan ((cho hieu) OR (co hieu)) qua ) or ( tinh quang quan hoi kiem soat ))*".