Perhaps you should try some spelling variations:
hien hanh » dieu hanh
hien anh » thien anh, dien anh, tien anh
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 hanh
va lang » va nang, hoa 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) OR (va lang)) 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) OR (va lang)) cong dan chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien anh) or (hien hanh)) - canh tranh ((va hang) OR (va lang)) cong dan chan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien anh) or (hien hanh)) - canh tranh ((va hang) OR (va lang)) cong dan chan cau*.