Perhaps you should try some spelling variations:
tuong dong » tuong duong, trong dong, cuong duong
hieu xanh » chieu xanh, hieu manh, hieu nganh
tang luan » dung luan
dong danh » dong doanh, dong anh, dung danh
danh than » danh thanh, danh thang, danh nhan
doc hieu » toc thieu, hoc thieu, hoc hien
than cua » nhan cua, thai cua, ban cua
than tap » toan tap, han tap, phan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - hanh ((than cua) or (tang luan)) tuong dong danh than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh ((than cua) OR (tang luan)) tuong dong danh than tap.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((than cua) or (tang luan)) tuong dong danh than tap*.