Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
khien bang » phien ban, khien dong
hien sang » hien trang, chieu sang, thien bang
doanh cao » doanh co, doanh bao, doanh cho
nang cong » nang song, dang cong, bang cong
cao nang » cao dang, cam nang, cao tang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sang) or (khien bang)) - doanh doanh cao nang cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sang) OR (khien bang)) - doanh doanh cao nang cong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sang) or (khien bang)) - doanh doanh cao nang cong dan toan ban*.