Perhaps you should try some spelling variations:
hien hanh » dieu hanh
hang cong » dang cong, hang nong, bang cong
hien anh » thien anh, dien anh, tien anh
tranh va » tranh van, trang va, trinh va
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau
va hang » van hang, va nang, va lang

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 anh) or (hien hanh)) - canh tranh va hang cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien anh) OR (hien hanh)) - canh tranh va hang cong dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien anh) or (hien hanh)) - canh tranh va hang cong dan chan cau*.