Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh luan » khanh luan, hang luan, hanh luat
van trong » van truong, vang trong, ban trong
vang toan » van toan, dang toan, quang toan
hoc hieu » hoc thieu, hoc hien, doc hieu
dan toan » van toan, dan than, manh 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 luan van trong cong ((vang toan) or (((dan toan) or (van than)))) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh luan van trong cong ((vang toan) OR (((dan toan) OR (van than)))) cao.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh luan van trong cong ((vang toan) or (((dan toan) or (van than)))) cao*.