Perhaps you should try some spelling variations:
hang quang » dang quang, hong quang, hang quan
tinh hang » tinh khang, minh hang, tinh hung
quang van » quang ban, quan van, quang uan
hien soat » thien hoat, bien soan, hien luat
kiem soat » kiem toan
dung lam » dung luan, dung tai, dung dat
van hieu » cao hieu
lam van » lam san, nam van, dam van

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 lam van hieu qua ) or ( tinh hang quang van ((hien soat) or (kiem soat)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung lam van hieu qua ) OR ( tinh hang quang van ((hien soat) OR (kiem soat)) )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung lam van hieu qua ) or ( tinh hang quang van ((hien soat) or (kiem soat)) ))*.