Perhaps you should try some spelling variations:
dang quang » dung quang, dang hung
hieu hoat » hieu hoa, thien hoat, hieu luat
nang quan » ban quan, nang suat
tien soat » trien hoat, thien hoat, kiem soat
dung dat » dung va, dung tai
van tien » toan tien, van hieu, van tuan
va hieu » van hieu, va dieu, va hien

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 dat va hieu hoat ) or ( tinh ((dang quang) OR (nang quan)) van tien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung dat va hieu hoat ) OR ( tinh ((dang quang) OR (nang quan)) van tien soat ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tin dung dat va hieu hoat ) or ( tinh ((dang quang) OR (nang quan)) van tien soat ))*".