Perhaps you should try some spelling variations:
luan nhung » luan chung, luan hung, quan nhung
nhung cong » dung cong, thong cong, hang cong
hien hanh » dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
dan toan » van toan, manh toan, xuan toan
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 hien hanh - hanh tang luan nhung cong ((dan toan) OR (dan than)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hanh - hanh tang luan nhung cong ((dan toan) OR (dan than)) tap".
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - hanh tang luan nhung cong ((dan toan) OR (dan than)) tap*.