Perhaps you should try some spelling variations:
quang trong » quang truong, quang trung, quang thong
dung ltrong » dung trong, dung trung, dung luong
ltrong van » trong van, trong va, thong van
quan trong » gian trong
hieu suat » hieu luat, hieu qua
hien soan » bien soan, thien toan, dien toan
van hieu » cao hieu
van hien » van tien

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 ltrong van hieu suat ) or ( tinh ((quang trong) OR (quan trong)) van hien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung ltrong van hieu suat ) OR ( tinh ((quang trong) OR (quan trong)) van hien soan )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tin dung ltrong van hieu suat ) or ( tinh ((quang trong) OR (quan trong)) van hien soan ))".
• Adding a wildcard symbol may retrieve word variants: (( tin dung ltrong van hieu suat ) or ( tinh ((quang trong) OR (quan trong)) van hien soan ))*.