Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hoc hieu » hoc thieu, hoc hien, doc hieu
luan ung » luan hung, luan chung, luan luong
luon ung » luoc ung, luon suong, luong dung
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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