Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu manh » chieu xanh, hieu nganh, dieu hanh
manh toan » thanh toan, anh tuan, tinh toan
hoc hieu » hoc thieu, hoc hien, doc hieu
cua tong » cua cong, cua dong, cua song
cua nong » cua cong, cuu nong, cua dong
dan than » dan chan, ban than, van than

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