Perhaps you should try some spelling variations:
thiet danh » thien danh, thien anh, tiep danh
thien dang » thien bang, thien danh, thien nang
nhung cong » dung cong, thong cong, hang cong
tranh cua » doanh cua, manh cua
cua nhung » va nhung
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 ((thiet danh) OR (thien dang)) - canh tranh cua nhung cong ((dan toan) or (dan than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet danh) OR (thien dang)) - canh tranh cua nhung cong ((dan toan) OR (dan than)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet danh) OR (thien dang)) - canh tranh cua nhung cong ((dan toan) or (dan than)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet danh) OR (thien dang)) - canh tranh cua nhung cong ((dan toan) or (dan than)) cao*.