Perhaps you should try some spelling variations:
thiet danh » thien anh, thien dang, tiep danh
thien danh » thien anh, thien dang, thien thanh
quan nhung » qua nhung, cua nhung, luan chung
nhung cong » dung cong, thong cong, hang cong
tang quan » tang luan, nang quan, tong quan
anh tang » anh bang, anh dang, anh nang
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang

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 danh)) - anh tang quan nhung cong ((dan than) OR (ban than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet danh) OR (thien danh)) - anh tang quan nhung cong ((dan than) OR (ban than)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet danh) or (thien danh)) - anh tang quan nhung cong ((dan than) OR (ban than)) cau*".