Perhaps you should try some spelling variations:
danh quang » doanh quang, dang quang, dinh quang
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
quang van » quang ban, quan van, quang uan
kien soat » kiem soat, bien soan, kien hoa
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
van kien » van tien, van hien, van chien

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 ((lang van) OR (dang van)) hieu soat ) or ( minh danh quang van kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung ((lang van) OR (dang van)) hieu soat ) OR ( minh danh quang van kien soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung ((lang van) OR (dang van)) hieu soat ) or ( minh danh quang van kien soat ))".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung ((lang van) OR (dang van)) hieu soat ) or ( minh danh quang van kien soat ))*.