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 cam » doanh cao, doanh chau, doanh tai
nang cong » nang song, dang cong, bang cong
cong dan » cong san, cong tan, huong dan

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 cam nang cong dan ((toan ban) OR (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sang) OR (khien bang)) - doanh doanh cam nang cong dan ((toan ban) OR (van ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sang) or (khien bang)) - doanh doanh cam nang cong dan ((toan ban) OR (van ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sang) or (khien bang)) - doanh doanh cam nang cong dan ((toan ban) OR (van ban))*.