Perhaps you should try some spelling variations:
chien soat » thien hoat
dung quang » dang quang, dung quan, luong quang
quang van » quan van, quang va, quang vinh
hieu soat » hieu suat, hieu hoat, hieu luat
quang uan » quang tuan, quang tran, quang chan
quang ban » quang binh, quang tuan, quang tran
van chien » van hien, van tien
van hieu » cao hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin dung quang van hieu soat ) or ( tinh ((quang uan) or (quang ban)) van chien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung quang van hieu soat ) OR ( tinh ((quang uan) OR (quang ban)) van chien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung quang van hieu soat ) or ( tinh ((quang uan) or (quang ban)) van chien soat ))*.