Perhaps you should try some spelling variations:
hien manh » hien hanh, tien manh, hieu manh
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
chan cau » phan cau, can cau, chinh cau
chinh ca » chinh ta, chinh va, chinh tai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien manh - canh tranh cua nhung ((cong dan) OR (cong tan)) ((chan cau) OR (chinh ca))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien manh - canh tranh cua nhung ((cong dan) OR (cong tan)) ((chan cau) or (chinh ca))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien manh - canh tranh cua nhung ((cong dan) OR (cong tan)) ((chan cau) or (chinh ca))*.