Perhaps you should try some spelling variations:
quang quang » quan quang, dang quang, dung quang
quang thanh » quan thanh, hoang thanh, muong thanh
tinh khong » tinh khang, tinh huong, benh khong
khong quan » thong quan, hong quan, thong quang
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 quang quang thanh ((hieu luat) OR (hieu qua)) ) or ( tinh khong quan va kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang quang thanh ((hieu luat) OR (hieu qua)) ) OR ( tinh khong quan va kiem soat ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh quang quang thanh ((hieu luat) OR (hieu qua)) ) or ( tinh khong quan va kiem soat ))*".