Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
hanh tranh » canh tranh, hanh trinh, hanh trang
thu phuong » thi phuong, thu huong, theo phuong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
hoc hieu » hoc thieu, hoc hien, doc hieu
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

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 - hanh tranh cua ((dung phuong) or (thu phuong)) ((dan than) OR (van than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh tranh cua ((dung phuong) OR (thu phuong)) ((dan than) OR (van than)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - hanh tranh cua ((dung phuong) or (thu phuong)) ((dan than) OR (van than)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh tranh cua ((dung phuong) or (thu phuong)) ((dan than) OR (van than)) cao*.