Perhaps you should try some spelling variations:
doanh tranh » doanh thanh, canh tranh, doanh doanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
chua bang » chu bang, chua nang, thuat bang
chua xang » chua nang, chuc nang, chu bang
cong bang » cuong bang, dong bang, hong bang
hoc hieu » hoc thieu, hoc hien, doc hieu
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - doanh tranh ((chua bang) OR (chua xang)) cong bang ((than cau) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - doanh tranh ((chua bang) OR (chua xang)) cong bang ((than cau) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - doanh tranh ((chua bang) OR (chua xang)) cong bang ((than cau) or (than cap))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - doanh tranh ((chua bang) OR (chua xang)) cong bang ((than cau) or (than cap))*.